Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cf11d518048af0…

MALICIOUS

PDF

85.3 KB Created: 2021-07-29 23:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44eef6fe42464df925af3fa4478477eb SHA-1: ade27b63f73c5315e1836f33c598515b1cc56ea3 SHA-256: 86cf11d518048af01d8ed41fe57546e525c1aacfda0add1f3027bb52df824cf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • 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://elmaga.lt/components/com_mijoshop/opencart/image/data/files/70066747947.pdf In PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/modomib.pdfIn PDF document text
    • http://splogservice.ru/content/file/76528856967.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6577ed2673433f806000eeddf49e39fb/22972213031.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/i07acia5g9h1f53bjuid74576o/bufiruzotev.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/76895448393.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xoveropita.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/22420074624.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a305a544---23226647018.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/uo34rq111hspbl8jcj711g9oab/povomusebozajiluzux.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d45648c4010579673c322537230dbfca/50621974268.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1664bba9---nakamazawekujazawometile.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d02e7fc7c3c69266630816e7729fb365/40441976947.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/23046605445.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/vudamifovipavo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcc11bd54---60063850783.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/dobiwewakujikikomixel.pdfIn PDF document text
    • http://klinok-saintp.ru/files/52177347353.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/79827437160.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/55604000337.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a98671e9df83b23153976795254b401e/rijikunipolavaru.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96925ee8d6---nokigojukewani.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4f549f6a---nasepemipujato.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5c8c3cf01f9db2b8940ab9359521fcf8/tavujedubezafutomuwali.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740df61d16b---korifelowenikosapogixavug.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/27828469024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=7th+grade+life+science+textbook+mcgraw+hill+onlinePDF 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_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 11296 bytes
SHA-256: 1d92b5669a4b0c885cf432f61855a85bdfc1f0f913b88e2c3a0ad8f8d2e09a3c
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 16888 bytes
SHA-256: e62894618b06ae3fc91fb536b60de7812875dcd84703a096419f2ca149be57cf
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1