Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9282c752fbfae5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 14:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04060e1f8b5e4252d041b32a1c0e5c14 SHA-1: 1eb74449fd97c5f72b0bdfcb76a88b479fc78ba3 SHA-256: 6a9282c752fbfae598d4036ae57ecd82ca135ac2e1ac9848d083d85041f5f39e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs lead to compromised WordPress upload directories or disposable domains, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://studioingegneriavaragnolo.com/userfiles/files/nabubowifovexij.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf1bdd249---49760673009.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/gekelipuradagibeses.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/89533610834.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/toliniwugotusaxeditipizo.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202108311122569425.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbdc49f73a726adcf2b3d5e35b1dcffe/dapapuxugipiv.pdfIn PDF document text
    • http://surausa.com/uploads/files/5007044668.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/81554368247.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/jerozevagul.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/aafce0f8a2d48cebb1dbd27d5ac1073c/81345726985.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73443bc5c7---40472623325.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/timixugifuwerexovimoz.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/31699414622.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/58257669052.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/89269256893.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfe81f1a3a95feb6ff57902a2a29aed6/malojisukit.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/molavutojatumipuxodafaxu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/58392076845.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/fenalumuxoxisoregarago.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cb6ade5a5---65631658445.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f0d77a286---64044668923.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/12463073855.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b66c14ca8274ab66dd46b99c481a3202/fomixasowufazivito.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f22b44f8f7dc48e3631d28c5eb230bd7/44868268429.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/tijutitutolujole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=panasonic+ne-1054f+manual+espa%C3%B1olPDF 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_off0000c3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B0 19888 bytes
SHA-256: b44cde5241325e12a839e0e0026612b74effa1076ef0eeb378f20d22e066742a
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 11168 bytes
SHA-256: 03ea11edae06744060e6badfca0da56cf72ca66ed94345b99a88dd6ac82d83e8
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1