Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c56bfea580b64ef…

MALICIOUS

PDF

224.5 KB Created: 2021-07-13 15:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 39d6f163ae7a588e1bc9317d382a17de SHA-1: 844852d8470d3afb5820b14744d2ac433aae985b SHA-256: 3c56bfea580b64ef9cd4820c73e31c9379f191f071995245c27a2e9ff60f305a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains multiple links to external websites, many of which appear to be compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs and compromised CMS upload links suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9689

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://irlanc.ru/uplcv?utm_term=aeroplane+red+hot+chili+peppers+tab PDF link annotation
    • http://niestachow.pl/data/aktualnosci_imgs/file/52612588547.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/36694994138.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0921766c---48101776249.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/n4vtbvljncns6kgl822hdkaoej/49621472175.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/14811267735.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jubufutonosasus.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/14095329577.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/81e8fe0089887e4a2d5bb9c215d264c0/92507934360.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/silimanufavalor.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a34ec65dd---xenaxigezakiretomegefej.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e0cc0980d4a02c32191f337ac61c030f/nigimakoguwipa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc406e638c---gevamove.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/zaduleputufobetowari.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a853197f2bf67c9cd2daa022977f5743/tademav.pdfIn PDF document text
    • http://pronobile.de/catalog/file/kuvizav.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/a2ognk7ume3nnvlpej2v0pfh0b/fafip.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fanunesox.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pmthb8q0nhg4ra9n4vshb5e476/49883660995.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbb7d3ae2b---22895573621.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e7b41ea8ae4f07130789db21d7b4d515/87769986517.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57f562810---61532117393.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/kolegi.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/sajeven.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/loberu.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/70516113892.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/2971983985.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4509f4e8fbd07172450ad487e2c759bf/34556867362.pdfIn PDF document text
    • 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_off00031533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00032d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D45 18024 bytes
SHA-256: 01a6e45c1916cbb408910f97386c4917997bdc1210cd6c4dde9675b76cb26853
font_02_sfnt_off00035bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35BB4 10732 bytes
SHA-256: 278ab53c07eaaff76827c8dec3bb1f017c91fbe4af36cef7e9e829ed8d295dfa