Malicious PDF — malware analysis report

Static analysis result for SHA-256 004aa236104e8fc9…

MALICIOUS

PDF

89.4 KB Created: 2021-07-21 13:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 072a688057a7f022c214e9a1340f57f3 SHA-1: 8fec50c2c548c2095fb065a9de6b81c401b76933 SHA-256: 004aa236104e8fc9b17007fe9cee891c8ee71c25e7b5b2a3e3566cd29f6ab26a
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 http://drapikowski.pl/uploaded/fck_files/file/sagemal.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a53f6bcf16d0dd56a82369cda69f2886/66017173479.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/58032c1d419c7e030ddf27bfb186b08d/xixarewogafawaworuve.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k76foh8dos2gh6m820vasqnqdd/migobekemux.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/numikepelisawux.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bks0kq57p3h9j8g81tn1doac21/65826209430.pdf
    • http://mmckno2010.zkosuchdol.info/files/liwox.pdf
    • http://colorfulmedia.de/fotki/fotki/file/41330892740.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/c14m6j0b0g781hjj0ep1d58eo3/xasuperujaguvatura.pdf
    • https://aimara-bg.com/userfiles/file/ruvatifisonuweru.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f55c0e04e29---39592859348.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8ooqu1rojdb4k9sogs4itde5f3/xekanijowe.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4f5fef8cf099f800a70b45cd0e5f2478/65481301876.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97b6f0bf8---67981310681.pdf
    • http://tele-video.ru/upload/files/wititabamomubevajimisu.pdf
    • https://ladangmimpi.com/contents//files/15948856299.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/vajimusiwefojamotod.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/03595c5692b70ff360923bdd284a6927/vokegigezejividi.pdf
    • http://championsview.net/userimages/rukebiw.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2523452d---wemumiwixupisanigal.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/f0u3f10r2t7s61irut7m4b2aa7/86168063795.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5cb82d81---pefuwebur.pdf
    • https://adtw1.com/ckfinder/userfiles/files/53303410736.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+do+love+is+in+the+air+quest
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a4.bin
5542b2b917160f2d92589b16d26cf06c0617a7f1b3781140dbdcdb05a3820830
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10736 bytes
font_01_sfnt_off00011201.bin
7362a451bf47a63d5948398ac653499e2cc832d15b5ac02a2e6ad6cef7260eec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 17772 bytes
font_02_sfnt_off00014062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14062 16792 bytes