Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e78885de9d4bbe8…

MALICIOUS

PDF

98.2 KB Created: 2021-06-29 09:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c3f3f836dca4c7db41b2f55129927f3 SHA-1: 05c099fc79d26c1008cb4ed7335b73d6954b40fc SHA-256: 2e78885de9d4bbe8af8875ccf3737649215e450c894eebfdfca71003f81ef6bc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure itself are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pinpointfeedtech.com/ckfinder/userfiles/files/dekofipojamewaxazulob.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d58d75ce33478a52c62385da93294397/firotepusidedavunela.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a109a640977c79fc42974d4646f4e38c/91896208497.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/luzosewutu.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cfa59af19---vusogalixutuwavobidoxep.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74e56ed19---60633587958.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/24789666905.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/355192bdb33a26c1d9ac2860fcc9bd3a/zapozixodexiva.pdfIn PDF document text
    • https://mmszke.hu/files/file/gurakega.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gatagimo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd92aa78d87---75857245042.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/47c0117ddffd8e998e4be4254c7c20d7/72432792990.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/36af27489a20a2bf2f07b2355e3e099b/33980923044.pdfIn PDF document text
    • http://computerdoki.hu/user/file/42113053297.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16089d2c3c2952---30483089337.pdfPDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c057f5cf1a4---nefisowip.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/3098380060.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/13443937227.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/jirezufoka.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6ef2822d9493c93dc380eb09dfc93c70/52568687958.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/mupelofisajegibulitudurir.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g47lucpmhl28fmib4ec182pfh0/sebubukofilovowotukofufuj.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094718518b14---mazevupilutedabovikun.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5eecd5fad8ca01d8e0ebe3c956aa2f9a/rivefofi.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b33133454---30124762559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+witherhoard+destiny+2+beyond+lightPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077190e61f5a---52707527319.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 10976 bytes
SHA-256: 9637c4e393332682f767e879972a3056982194808719191ae332e78df656dc94
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 17520 bytes
SHA-256: a5b6a2bafb1b7c3bbba02d655f6f3c9ee2edf7a7172161934f0f2d1dc62b9157
font_03_sfnt_off00016536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16536 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16

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