Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff6f56b50485523…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 05:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f13dfc3e5de59529cf0c5618fd41ff7 SHA-1: 43b6650e2260fd3c58b464db9a5eb95ff70412cf SHA-256: 7ff6f56b50485523e50344ee04cc5eb9522c6c1f8c8d030a9122e9d24618371d
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to potentially compromised websites, some of which host other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a tactic of using link farms on disposable or compromised hosting to distribute malicious content. The presence of JavaScript suggests an attempt to execute malicious code, likely to download a second-stage payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic, though not directly actionable from this PDF alone, suggests a common tactic to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://topspeed4wd.com/ckfinder/userfiles/files/33648508947.pdf
    • http://3dtechgroup.com/uploads/image/files/rowusixedomabutilumoru.pdf
    • http://erex.hu/upload/file/89930255617.pdf
    • https://sssmri.com/ckfinder/userfiles/files/31469700262.pdf
    • https://vendax.ro/files/file/83957540542.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614504f90953a---xevawasuwosovigokik.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161444b786c751---14882673660.pdf
    • http://aromaonly1.com/yamituki-n/uploads/files/16333152799.pdf
    • http://manisafar.com/basefile/marcosafarir/files/68731350581.pdf
    • http://jysfh.com/upload_fck/file/2021-9-16/20210916232635847675.pdf
    • http://grandp.ru/userfiles/file/kufaxabitovi.pdf
    • https://tanhaithanhvalves.com/quangcao/admin/file/muxubikelirobinujugiwo.pdf
    • http://baugeraeteverleih.de/benutzerdateien/jezonosogupurasetopabife.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cf2678e50c89250fc615dd8f70bfe167/gukoveraxegaz.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/92126812264.pdf
    • http://citysoupsbellevue.com/uploads/files/rogebagulawunugiri.pdf
    • http://charolais-hessen.de/write/userfiles/file/59861064622.pdf
    • http://ubest.ru/images/file/sunagezukatagixag.pdf
    • https://misbahelmudii.org/ckfinder/userfiles/files/85030615334.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/nazegugomopolapopifi.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/26704335356.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/wujup.pdf
    • http://lenosada.sk/editor_uploads/files/wowowotej.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/wimudone.pdf
    • https://foundationkuzmanov.com/files/lesesuzogepude.pdf
    • http://zopos.zohukum.com/ckfinder/userfiles/files/93984228296.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=package+disabler+owner+app
    • 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_off0000e0e9.bin
5a9ce96a465a189dc1b23467bb3bd08c352b60ef98cca4a58a31f8453541d04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 17968 bytes
font_01_sfnt_off00010fc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 16792 bytes
font_02_sfnt_off000127d7.bin
8cef7b2ca2b459aa6cebc84b496396130c2326fb8d73348e332f961790914b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 10912 bytes

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