Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2c5ddcd47d3d71…

MALICIOUS

PDF

289.0 KB Created: 2021-06-30 12:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: becbcae63fe2a4e9e3101d8f0eb3f62d SHA-1: b820a6d6862ff0728bdd21e5a36fc6abc81561d5 SHA-256: 5f2c5ddcd47d3d712829bb0a33ded8bdb1af819c9fac3c6abc5e51f96f51de82
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign designed to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of compromised CMS upload links and SEO redirectors points to a phishing lure for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9663

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://ivanda-commerce.hr/userfiles/file/16129557253.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b4877defa2a---soxefozikisepanam.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/9143289437.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210630064900_emVrYWxhbmV6dWtla2F0ZXg=.pdfIn PDF document text
    • https://arerp.kr/data/file///digolabizirikijegib.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/32074473537.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b0f65573---sirob.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/t6keft6728jd24s2p904r45qd4/5908769629.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/25069520978.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19882e8ef3---wopatesavopame.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f96c65076---77487297095.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/getorufevisiz.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/84264359290.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8b497ebe2a211745bcbe4382f1fedb95/73273334633.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/wamosujiligusuwomabita.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/41fd6a8eafbcaefc1cf57309a381c4d8/39283762703.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43b04f3a7---rikerulomokexiwizelu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/72901020526.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072318437207---11503361262.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da242d1804---44159941219.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cfb4187f9---fuwapodasepama.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94889ab589---lisiguvugipajitod.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/pmmvqldpjup1pmv9kdir904sq6/surusosujavunijita.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/76819680001.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b19106337---fosopoxofilitubub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=victory+victory+is+mine+yes+i+know+oh+lord+lyricsPDF 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_off0004157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4157F 10800 bytes
SHA-256: ecae2dd50a5efa9348ddedd12b63107ad844c7bbe98618a156480d1230cd3132
font_01_sfnt_off00042e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0004465a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4465A 18060 bytes
SHA-256: a89208d75d77c9e10489cb04be81b1640864f86b486213b49566326d42857bae