Malicious PDF — malware analysis report

Static analysis result for SHA-256 49018f3b651630f3…

MALICIOUS

PDF

69.0 KB Created: 2021-09-14 12:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a026cb6e60b0da2448404c0706a0dfc5 SHA-1: e885ba9a01ccecd76bdf5028d9ccc21c233c7c2a SHA-256: 49018f3b651630f37e0b6d0d653a9cf0d48eebd0d16b274a10437a57bf329f85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the overall structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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 http://weforyou.it/userfiles/files/garalijaxamalovo.pdf In PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/11808996739.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/xumataxoxubil.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/77838860553.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/xobagumitonoxakijosokago.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nukeselen.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130714fe26c2---57936022433.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/liwutajito.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/derudo.pdfIn PDF document text
    • https://forumsevens.com/images/file/68710471469.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0b0c6e1d23c13f34d2c1ec4f44650b63/4035220507.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcd66656e---99122621995.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387b470d36e---17287631439.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/jajimibijavarabenof.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/22043804952.pdfIn PDF document text
    • https://medpressa.ru/files/file/sipigadedazimewotipi.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/4669368840.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vajofexiwoj.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/41531173861.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/11960898358.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/63398380539.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/80f95d7d88acc7f6cf4897cdcb3b5956/pufobajiboxuvegu.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/72053751288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=instagram+iphone+version+for+androidPDF 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 10916 bytes
SHA-256: 0f70b08cba2ef5efd9d882259704dd1b765e6dc2e6a5e7ba976daf6e636eb9ea
font_01_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 14656 bytes
SHA-256: 5754eaf62102a308c467075ae8955bbdcc2b324ce7690fca5324d2faffd87bde
font_02_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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