Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb5e2be5ab179d4…

MALICIOUS

PDF

92.3 KB Created: 2021-08-11 20:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a470834a8662e786c1d48fca55f2e6f2 SHA-1: d2c90b1c5e0d2be8517be3004ab86001ecf14678 SHA-256: abb5e2be5ab179d4c4adeefc3619ac6f5b5a722dd6d32f46bcc8cfb2bbb6dbae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware. The primary function appears to be a link farm for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030e0099742---47309767179.pdf
    • http://ranchobg.com/img/file/zaxufogobesaxavejox.pdf
    • https://alshaabcoop.com/userfiles/file/wuxelibafa.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4b108d2afdf5be96df97305577c5044b/62799929873.pdf
    • http://dgxzz.com/uploadfile/file/minatepepululoxepam.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16486941e4---18071270472.pdf
    • https://rafaela-motores.com/userfiles/file/midukusamawuxuziwuto.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/36b041df629dc20ea07762b56d627912/revoridodagago.pdf
    • http://garderoba.sk/images/_file/46535011328.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/68133550927.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0b057904---ganakilivevowa.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vj9oc2loeou96cpp6vtl6506af/23510140479.pdf
    • http://mazraeir.com/images/upload/files/35670735060.pdf
    • http://stlukesmn.org/clients/17773/File/nidulowodoguzixizurigeted.pdf
    • https://gamma-electronics-eg.com/userfiles/files/rovakiwuxikojidinesipot.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5f200e134cf37fc3d79bc8928de9234b/38680657038.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c532f9f428ba18da818b4f7cf884247b/84795445516.pdf
    • http://www.siposferenc.hu/html/45160988732.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/64266561419.pdf
    • http://asfcursillo.com/clients/879797/File/vepuzujarapefi.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f909a400ab0f771d2fa27e020e30c5f9/45785369137.pdf
    • https://west-holding.com/userfiles/file/gejafot.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607797db16cfd---93962013444.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oe3uo076jaqu4o0je81sis53re/74129723722.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=uses+of+electromagnets+ks3+worksheets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001021d.bin
28768a27dce80365bb8f912856c6754c50b0e7b73ab23d93de41eacff073c7b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 17948 bytes
font_01_sfnt_off000130fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 16792 bytes
font_02_sfnt_off00014913.bin
046f3d8cfca255862091b0bc3436c2992fd5b048c7db4a1caa097abe3667c200
pdf-font-stream PDF embedded font (sfnt) at offset 0x14913 11048 bytes