Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a281b47c8fae5e…

MALICIOUS

PDF

99.1 KB Created: 2021-07-17 10:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5f6c4bb6697d1f33423a14b000e074e SHA-1: 02f12de86c61eef3ab751457426925d5c41d6ec4 SHA-256: f2a281b47c8fae5e8896cd2918ec235da2fcb1148bc9e2c1a26fea53c1a6394c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://kammatrans.com/userfiles/files/45434427741.pdf In PDF document text
    • http://staresecurity.com/userfiles/file/lumeveguxo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210516002847182.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c18477f4e12716bba5fa3c8cf1b15a82/koxuzekiguzawu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2faef279---zirebugukibararid.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/nujunosuvudav.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5b734608e3460be153f034b3fbd60dd7/jatogedisaresib.pdfIn PDF document text
    • http://mayjack.com/upload/files/lavos.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6ddbc67d0284482afd598bd06b0a6766/99654722852.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39bccb76e7---gapebupazorojawoweroxi.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gawezakalegusexosunap.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/nofemat.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccea7761c5---gapopisujot.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839bad0b1b4---8488334236.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/radugugojexesebumibusen.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7aacf7a7061df40a0422b28d53745b78/82198057773.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb39d4a4c---xajik.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/506e8c5a405bad06d6cd34fef235e824/7765511367.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc078c6229---32207810807.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aab649c659---nevazobo.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/tisitalesorili.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/19201017946.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/92339176255.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/lddbrgoghf7vi48314sv5sdb6r/53398997102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=digital+logic+design+lab+viva+questions+and+answersPDF 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_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 17576 bytes
SHA-256: 3ca5634f136c24823cc117f138002ce9eb445f13babbe623bfccca24e2a809d0
font_01_sfnt_off00014d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2F 11084 bytes
SHA-256: 1f73d984de34c399c04b707420e0bc0daad98accc1dbfef48c49743c32a20d42
font_02_sfnt_off000166b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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