Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd9dcdaddd6d6ee…

MALICIOUS

PDF

82.5 KB Created: 2021-07-20 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6350cae3bb3bfd4316eb1439f1f3a91 SHA-1: e3b80d9a1da1ab0943c8ab3ba01b3ed96c46151a SHA-256: 5fd9dcdaddd6d6eeae5a9c9e82be731bdb5511194a983754e248e416359ba2be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecc0e757a2d2c5857f4749d301c8d41f/xovogerudo.pdf
    • http://erictex.com/ufiles/files/82802245845.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/69d1d5d74909605a9575ca5ea8d17f88/xufupakugilevopuwet.pdf
    • http://uticachemical.com/files/upload/files/81549444727.pdf
    • https://agatanorek.com/files/file/rajopadokile.pdf
    • https://nestaerospace.com/uploads/file/81380250305.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5c3161081---79957380993.pdf
    • https://x-software.cz/data/file/62516586290.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7c710b3fde1360682ee31bb3a90c9334/38168979765.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a409879004c---segozuv.pdf
    • http://specimport.by/files/files/nogusudabuluzutibefizero.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3163cab6---wetunexijixasuju.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/237489a070fcddc4eac8851fc0b04336/36465803378.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/m1k0lda3dvmu6sr28ou13n4tqc/xajipoxakizogakaxolanolo.pdf
    • https://aterhesseg.com/up_image/file/1893241047.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d9584e70a94---57820534541.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/sefoxepara.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f26912dc14cb27eccfdfc1696d88f557/vifinar.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef0910f51---62159647279.pdf
    • http://asremajazi.com/uploads/files/mizagolugonagixogusoradul.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09dbb4562---88250888307.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mission+and+vision+as+a+teacher
    • 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_off0000e269.bin
3efaabc87e0312904990fdb5d252b4f4efd24cee39b99201472632442cbc8acf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 10480 bytes
font_01_sfnt_off0000fa2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 16792 bytes
font_02_sfnt_off00011240.bin
30308d9c4cf0b2cb20e0de9ee0167d7347c8d8bd700429073779a7ba7a0e3a51
pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 16536 bytes