Malicious PDF — malware analysis report

Static analysis result for SHA-256 2854736dd3dc22c1…

MALICIOUS

PDF

81.1 KB Created: 2021-08-15 16:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cc43a8d40373d854dc4994199f68e8d2 SHA-1: b667dff863c7eebd0f86303c4a8aaedfc71707fc SHA-256: 2854736dd3dc22c1223b6f2c8a48b1bb3535e40015ea3f72be2864026f02260d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 81 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://lumieretvie.com/userfiles/file/48495278143.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080366325f9c---vonipufakovolap.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4bc49514d---79239062948.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/kakuduvavokefuvixu.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/lusevevunusubimetin.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/kimojagim.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/xugevonovoxido.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caebfec0fb---ruledimosoxakol.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/35917948147.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c7070b702148fce0df36c251fa0d422e/wekulo.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/78622012460.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/928691717f14bf5f0aabb52b158bbd4b/marizetijujageguxiw.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9uattk0gn7hovinsfq6u0fjkcb/bitovaduxitazavebil.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b06246306---kimetisevebuzup.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cd85af2b955178b4241eaa718729e95c/doguperaxejosun.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210714045637.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///gobowezakamizazafesix.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6fe07f1d---66031489783.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/ninokefag.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1820eb9144aacd1695e64ec5bee7bcb9/22320291639.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/20769614532.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c08d04d3b22d674b7e25580ecf737dd1/mazepe.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/14270152883.pdfIn PDF document text
    • https://oferta.lt/i/File/zotewapozavubiji.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160767ec8de216---ragejowekinexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=proyecto+cekit+electronica+full+color+pdfPDF 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_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 10752 bytes
SHA-256: ae641642a79ca0e911656083d4428b9a67210d0c7f0ec8a00d1b1c8cca3f8725
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 13948 bytes
SHA-256: 5db694d2ce8a03249e2d1d7442480ddbf025b1747b84f330e7176cf13c4f2f6b