Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55bd36724a68cae…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 09:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ac9d6d203f98776d2b64fd5b6909973 SHA-1: 4431ea6322b42ae8bdf747f61412538a26816e9c SHA-256: e55bd36724a68cae6cd38a4804aee2afb9e9cdab5fca57e96d62c0666c20b4bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d94a5807---vinimuzudijegibabifojep.pdf In PDF document text
    • https://leavingcare3plus.ch/userfiles/files/80973138940.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/51125481228.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/tazurawe.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d880338f2---zokupokoz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8b7c222675d079833bdef2ad8aca444c/99439335700.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/bofinazu.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/83815613311.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/12d370e9f98c38ee82b54768b30d82ac/xasomofesafusitupebunamaj.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/pewukabizunasokan.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/mra8c9h0l42r3siaeerdns1qph/gatiloges.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rtsh4rrvthpg8100m19uobfbsq/16133460682.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/demavexaruzapunelilunu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wagibulutufebew.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/iks1t1uvr96kjplee3np0vdj1g/82165687514.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/gowevesamokur.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16106d99ec1965---34756433351.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/d3f9962ea24768e9e839812c3b23a67d/70902667631.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/67669248082.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///noxaginu.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/83566853437.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ao2v34d1is4c9imi65kjfq3r67/jivebafop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=treatment+of+dka+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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 17436 bytes
SHA-256: 091cb3f0e698cf35f895683d3fac72a8542210adede916967c0db889f5047c8e
font_02_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 10408 bytes
SHA-256: 745634d5b49d8a31f99a5103fa1b43d26eb4242b652ca442f1f7bb5e9ffbe399

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