Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1284dc710575fc3…

MALICIOUS

PDF

83.6 KB Created: 2021-10-06 14:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 95888b54f33a2fa79fe53f9c01903bce SHA-1: 622afa1f5b794e065be7638d1adb993f70ff393e SHA-256: b1284dc710575fc38aedc1c2900c3d2c7ce205ba548c4e422ebab5326e63450e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly indicate a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://netshopnepal.com/userfiles/file/gupagajefegope.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///8710719488.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/37097896424.pdfIn PDF document text
    • http://status.cz/UserFiles/File/3947587525.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/xufikoropitupejidudo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161494fe179621---61381679569.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/850082958.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca4c5cbd56---31766233598.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/h89j14lapliap159hl86cgp598/dojadepipexanut.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161501bc684a6a---lizobuloledodizevuvu.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/davewevemamopubusipusu.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/940c4eba0e767869c652af7f6a2cd8d0/bawizekimitezoniwopo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614c19245570b---55057097324.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/16211901666.pdfIn PDF document text
    • http://lovesenergy.com/file/14407382316.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/23601601614.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/jedikar.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dae94402b72567b1938bfa07ba53ff06/karudupogubidolajinon.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/7444515504.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/zebujum.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/mijolunajabo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161482c2561d4f---37127933666.pdfIn PDF document text
    • http://farmina.ru/uploads/files/81317543761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=let+me+know+meaning+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 20432 bytes
SHA-256: d64e2cba48053a556f22959c8ce3fcf8235212eab4955b764421b569b38f884a
font_02_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 10416 bytes
SHA-256: d2c8e8c0b7da12b8284910f72a1fa9ca9649deb988093f5087ce3e57a8d45e30
font_03_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 16240 bytes
SHA-256: b893704bb312f64a4dfabb018549800e08c59d7964d1c4f20f088bf46d3ef204