Malicious PDF — malware analysis report

Static analysis result for SHA-256 c722e686c82509ae…

MALICIOUS

PDF

83.6 KB Created: 2021-07-13 16:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c5c7fd5e7f7c19ba7cda334567feb407 SHA-1: 265fe874fe4f828b89313dc618b0549d045758a7 SHA-256: c722e686c82509aea04f9e6c881291892d5fa112406ad7467e918abdebc1e6f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress sites, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were directly extracted, the ML classifier and ClamAV detection confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/nqh65o6koce15ikmiefjb1v285/60428157247.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b10558f971cd65c8fc3273bfa504a0f2/91527402121.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081329eb1ea1---99102289557.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/laseza.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/julobisibaxeguparureri.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f70f84896---80487139417.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/16908270786.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e0336cdb7754f4fc4c9b786035226215/wetexed.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/2174930083.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7795e2b770---mezojolimozujovusa.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/98658138103.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/953fd92da492a0522b1f3cf6b668ac57/87980471745.pdfIn PDF document text
    • http://sun-eko.eu/files/file/jefudatufalurefavasi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd9d784f88---fopadixovubukimu.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gekilenaluzak.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/lizib.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491a30d51d---romena.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xadiluviwixupumob.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4e1315a8f9b22586d1a0db7559229ad2/40179945698.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/04a760d09cd106b056b6b69a287dcf09/muvimof.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/35796567092.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/bidazefonur.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/nolotuborotowepeg.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0bb102ac---kadobeso.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160904f8e73afc---rupirejuwakifewatibi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/632f2d8a466c6c45b1f65302ab583a97/wimadilavatemovovaka.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/tazegako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kidderminster+to+foregate+streetPDF 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_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 10640 bytes
SHA-256: 36c234d03f1449bb1f4e90b007035ebc06581da62b5f33670d29ad43a3646691
font_01_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 17548 bytes
SHA-256: 4c8fdc701d20f96bf7ee82517db53a766a4e9833acba3fe40aa0f19fd33c22da
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1