Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e829a80da74730…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 01:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4a35a178c4ce3431a1a67257fc876c6 SHA-1: 08aa04252a6cb71d1a5bf06d027f4d4d212dfc35 SHA-256: 54e829a80da747301bb824e0bf4159906475fa78340bc0d37330a3675c354bce
164 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the document's purpose as a link farm on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3743923a484a663e3a7a5e9e11ad4971/bobaluvumoja.pdf In PDF document text
    • https://termoformat.md/img/files/wozasorigelagawusinev.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/zijudaraxusu.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/lakapiraxexagizav.pdfIn PDF document text
    • http://novichiha.ru/pic/file/22694648451.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b3060f0b---fatomuka.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/18030501416.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/nijofixuwupififidubuz.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210620105448.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/44312235929.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/86977957721.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/93843090045.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/36284530978.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/88921527121.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tibasofolojurazekidilu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/pejavotuxapijej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117daf02c412---niwudorugonerixuzarulo.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/zabuwe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/fipojuzakedan.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/gadogojotujigalonibodu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/038339ea3cba77595c00e117a49ffba6/2141366480.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3o9h5mp1a1m1ea0gjcf88hq99h/lixunufipexelimategaxakuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=2002+division+of+labor+standards+enforcement+policies+and+interpretations+manualPDF 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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 11232 bytes
SHA-256: edd9fa8021e6499e2efdf80d368533a48e6a92d7f85a3f68bb35ce2909d3ec2e
font_02_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 18852 bytes
SHA-256: aae8989bf33b4b562039382d7a473d974510739f3d29528b2fc90577d406b644

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