Malicious PDF — malware analysis report

Static analysis result for SHA-256 e546a7de9ebe4afe…

MALICIOUS

PDF

93.3 KB Created: 2021-06-29 04:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2f2ed2d50a2485f77bb511f04cbd856 SHA-1: 93a73e178020a1371b902f095b7cb0b614e63e27 SHA-256: e546a7de9ebe4afebbcd04a2fb25c47ad4f615b03b2c0dead7fa03f0ed5be574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites that host further PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://laborke.ru/uplcv?utm_term=rolling+pin+meaning PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a7aikbovvlmtnerl301503uro3/73431714784.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4fc0584a---fagekatugodev.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8b3b15991bfb0419b22f0af6932ee344/64963145919.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf04487a1a1---56233104661.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bb5190ae0---jujawowuwenuwaz.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757fffd44eb---4025523553.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/85669092164.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/59843090820.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/puwanekokakimopibutonute.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/pejederesejitel.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/621b488753b5ccad2ff28d948b7ffb70/56409174827.pdfIn PDF document text
    • https://steammining.com/userfiles/file/18471826640.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6fd4fc4855c38511a491e05cc9298d9b/najofezazowujubesezusu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5665c652---webuzasesufewidimud.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210619112909_v76wac.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160988b3c59348---wigobebulepixa.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e7dda1e2---pitipa.pdfIn PDF document text
    • http://vodnik48.ru/content/file/gezizizukiduxora.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160946c71bbbbd---zupugifopujakorexiseger.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/vijela.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/36177193361.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/832dc8e4b28b043104299a02e01459ee/rupivuzofevup.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 10276 bytes
SHA-256: ee640a8f77e966e82f71b42968054f3d0c71f8099d1ec7ee3273d909de181d47
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 20872 bytes
SHA-256: bcb500311eb9726c131e2ff59d404d4b4cbcc4b8a68c1ae23f5052433f6ccafe
font_03_sfnt_off00014279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14279 16752 bytes
SHA-256: 75b84f2a01f89da444d6790af88fa86d1de996e39ad28977e0ac9e18ff0f2289
font_04_sfnt_off00015a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A47 2820 bytes
SHA-256: 9fa5699507cb174ebcf8c3e11b8111f080cfc241e6a88b9db7e5e2ddde63bf5b

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