Malicious PDF — malware analysis report

Static analysis result for SHA-256 9317570b7228caae…

MALICIOUS

PDF

223.9 KB Created: 2021-07-13 20:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dce285393f9255b59508184c807160ab SHA-1: f7d70149a8bd9d00414713286cc0a1a544a30b58 SHA-256: 9317570b7228caae78627bf1a31eed806be2a0f001d1852a939c95e424934f22
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains a link farm that redirects users to compromised CMS upload storage, disguised as a free download lure. The embedded URLs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9008

Heuristics 6

  • 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.
  • 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://luminex.pl/upload/file/wetoxajata.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/anhueeln73i25auini953o0v92/84778815525.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092e61f08730---6281576142.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/robisugogemafesu.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/wogux.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4363581a1---18704935390.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/30ccafc748e4f7cbfdb16219c5bc66c2/98360408932.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815fba0e272---24455591097.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a6500196---munapejekojutijili.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/mulodipedaruwupekete.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/27073f446a458e3b463f537087c38b49/39404444847.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/82601213878.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091b739854c2---16496314249.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dabc5ca56bd---3651121510.pdfIn PDF document text
    • http://sam-global.info/files/file/66010842856.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be51c7678d8---logewusinogixizowezofajak.pdfIn PDF document text
    • https://tmtteks.com/files/19065922720.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xutadaje.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f129538492---54694966550.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/41993380795.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/ruzojafamad.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f90ada63fe---35637140438.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/42210097118.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1136e7738---58131187930.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/xobaxebaj.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/goxexolafaduwunawun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fairy+tail+canon+episodesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002128c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2128C 98304 bytes
SHA-256: 34f224af2f3e207211a80bfbbe219b2e0e7a467a5c8b4a981f04e85af451636b
font_01_sfnt_off000310b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310B1 18816 bytes
SHA-256: 57b971fe32b48c81be6009cac886a730f0edc8b98aa252ecf81d1c78ef613a6c
font_02_sfnt_off0003411b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3411B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00035932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35932 10600 bytes
SHA-256: d606108a7680c5ee99d558b84d5d6e8974569c4c147e31a91c0116ae966bd67c