Malicious PDF — malware analysis report

Static analysis result for SHA-256 21188cb50682f6a1…

MALICIOUS

PDF

84.2 KB Created: 2021-08-28 00:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b34781cb9de0383b27c1bda1247702c SHA-1: 5dc5bc43690fa9257f2e7c75f86f210ba601fea4 SHA-256: 21188cb50682f6a1ccafbf2956694e01b6778c3ebb54cddc293ccbbd32a054f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the structure suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eabd7ee57c---80693891784.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097b63f0eb0b---mijetopipofarepizu.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/12517138293.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/27539188657.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/aad02c3bf14573ed02489ba10a30d80c/dagipinokonewekaj.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/pc97d9kbulcs3dim4l01pckr4m/kufigelojefeterolegege.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/71462619933.pdfIn PDF document text
    • https://mavibusiness.it/file/31729479269.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2200e2aecbc1be1b9f5c54072998fb32/tixogiko.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/54484630001.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/wizekokuxepi.pdfIn PDF document text
    • http://bxwlan.com/static/editor/ckeditor/ckfinder/upfile/files/43062483779.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/22428955282.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f1f5deb1538923890936b355d8053533/tekerenijijufojegamenagu.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/74061212820.pdfIn PDF document text
    • https://isleo.com/i_photos/file/dapinijil.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9df0a2fd87c1411ecbca06a551ae9a2d/segasavek.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gfiin2sfetf1vudsalu9e3dj76/bopibibututikalufeguvewo.pdfIn PDF document text
    • https://defaico.com/d/files/tefeletikipurudute.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/61cfdodatv6jrqufhr9hiad3o9/14327798819.pdfIn PDF document text
    • http://strandedtattoo.net/file/kekavufuwipije.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/golajuritamux.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/634091489.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nuledozobebewakam.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/5e7996a757eaf175a4ab5c1eeeeffa7c/3555673019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=shoulder+length+thick+curly+hairPDF 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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 10864 bytes
SHA-256: 7deb367d5060f9258e6b4b55c015369822817a1f9eeeed8b93a671432d6316cc
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 17108 bytes
SHA-256: 192c66c81d264334d59a1ced7f2faf7ab9aa62e8ab8aee8466ff2bc8f1a0e249

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