Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fa9e2072b1a871…

MALICIOUS

PDF

98.3 KB Created: 2021-07-05 06:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9865b6464e0c4487ac0a5dca8929bfa7 SHA-1: 29fb4046e66bbab1e3bf8786e2f7a73c24bffc22 SHA-256: 86fa9e2072b1a8713d69e40b42a2e9025dd094e352b727261dca811dca8349f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing 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. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://etkindenetim.com/resimler/files/vukitimisirigekorika.pdf
    • http://teormech.ru/teormech/usrimg/file/60748113258.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f901bb5a5---65392528377.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c281968f4cd---xosurizapedaludimo.pdf
    • http://alliance-vietnam.com/upload/files/getovutasaruruvowoxaja.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/nkf6la31ofjeoqgeaqm386ekq6/mozeporaliwoj.pdf
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/1457498387.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/s8vtfecvei8abgoevujtcqniko/13713261113.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac3dd1148---pomobaninosisifetofuja.pdf
    • https://leanuslab.com/UserFiles/file/xikawazonujiz.pdf
    • http://dienlanhlongan.com/upload/files/jazewera.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ba9t7aesshfbgrnfiia7i1nr56/wosanimuliduwer.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f971e6d3c6ba9e04f21e1a3105c320c8/22889533682.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/foxodurodelaz.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lgcvtd8h5oqupn21095795j263/73472991017.pdf
    • https://dialogueinpraxis.net/files/docs/vumekokaluvudokivid.pdf
    • http://archifolder.com/userfiles/files/taxizubimokaxo.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa7abb2300---tiwowi.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f877d402039df0f4b2455e036cf25185/84414809733.pdf
    • http://tokyoracing.hu/userfiles/file/96064756318.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2f17ff19---39876528528.pdf
    • http://www.asslar.de/downloads/popokivadigoz.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a11c384a1---95813943240.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mystic+messenger+route+guide
    • 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_off00011a4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 16792 bytes
font_01_sfnt_off00013260.bin
8bbe7d072672c4bc901ba2517abdbf8833db3b58e3d55ec21071d47bac1a7bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 18164 bytes
font_02_sfnt_off000161e9.bin
a8ff60cec8203640f2267c65e876cfb20d97cbc6954b6da54d799071d1fbc34e
pdf-font-stream PDF embedded font (sfnt) at offset 0x161E9 10712 bytes