Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6d200f9a12b3f2…

MALICIOUS

PDF

90.4 KB Created: 2021-09-04 10:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ad3eae33f0c7f0574d7bbe075d8cad1 SHA-1: fd6207f3af9a870c5617313162c44dea1736ab1f SHA-256: 7a6d200f9a12b3f2963296f9bcd8aaa701ea95af76c5e13fada6fc4baf8e7c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm on compromised or disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, suggests the document is designed to redirect users to malicious sites. No scripts were extracted, but the overall structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vanrun-it.nl/userfiles/files/94038732617.pdf In PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2afc507bfa0a515eb7061fd4c81ece09/xifim.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/wedapavetudadi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac632f686---naxijifademirifewuko.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/12633554721.pdfIn PDF document text
    • http://change-sexy.com/files/files/tefegib.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/giwusukowanot.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d92a19fac---25163887472.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/tapilowaxomejosofatozu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a474d7c44ed---72415985941.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/futub.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06fb25d7faaa162041cf48a55d90959a/mekewo.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/66827085257.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/78231658550.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e8868d258e5d659ae9e4e0be85131428/47098875687.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/51189057836.pdfIn PDF document text
    • http://policylic.com/uploads/files/vamukiderafem.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d66dc78c3---88366642288.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/bodokutom.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/28357709039.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/61425165009.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gunovidibowizuvalapu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160989aa1a3831---17194165213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=manual+dremel+4000+portuguesPDF 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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 21688 bytes
SHA-256: 111384a652895ae951e297ddc63c8edaa71e9cc5eb3a77bb52f15dc1767b37cc
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 17804 bytes
SHA-256: 565e2fb8c41a57eece46c5840d9b496480f9bebcb44a5e87cc5db56b3793d5bd

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