Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac076ab6981b90c…

MALICIOUS

PDF

83.8 KB Created: 2021-07-22 10:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ea9a4be9622dcfebcdb50b13477e0a7 SHA-1: b6112c5f040b36855bbfb4d563844a5f8685b612 SHA-256: 7ac076ab6981b90c39a29560bced3c006fed9cc0ca0adc5d551d651956582a8a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download' button lure further supports this. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://cck-brno.cz/ckfinder/userfiles/files/46449836704.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d0afa1f6abbdb9874f3d8ee97a9e48e0/detowesebanadumunubupir.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/29754680144.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/98923426791.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/p839n0kvfvarbea5fj22sjipc7/fivaluguzotusetesujevima.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375f539900---3481354502.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ulg4tuuttb0pihoetjunhagm5u/25752224055.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/52634474999.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/3104112275.pdfIn PDF document text
    • http://abwessex.com/uploads/files/78472302733.pdfIn PDF document text
    • http://willbramephotography.com/xinoluma.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/narivinajefawufafil.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/634800a624cdcf46f40ba39180a2902d/xezibenomedunaki.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/65065905665.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/lujukizunevumedab.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/20888894cee1de5a14b8f8bf2c1fa449/kenetomozubem.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/9p7ia2ckt5eh6c663hng57bkdq/susibokedufiwejuxi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ec4f8655baa06e6b455d71e5041ac097/kujinuruwetumopowejosowim.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/86153410218.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/22ee27f5f313ab25b1170a638d9321e7/86520894450.pdfIn PDF document text
    • http://teledirk.com/d/files/mofonuluro.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c616807cf43---nikefebeditarikez.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/90197889636.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///13881637986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cbse+last+year+maths+question+paperPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 11048 bytes
SHA-256: 322bea1ef5259d73248729d03007fc7f3b7ad95fe5884bf569dac3e255b6cc7a
font_02_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 17480 bytes
SHA-256: 00650c2e77664efa74ffabefc42ff5eeb976fe132a4e8ef4f64df1074aca283c

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