Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2a5b24581cae87…

MALICIOUS

PDF

88.7 KB Created: 2021-08-11 19:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caed4749f3b3a6c6289321e8fa8df921 SHA-1: 2bd6203ee21f70b8ca0be9818e92b010a04387fc SHA-256: 7b2a5b24581cae87416dafbac5a13e7b86bf27c66ccffc10d69f64a82137103c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=how+can+i+get+a+free+product+key+for+windows+10+pro PDF link annotation
    • https://unitjaya.com/contents//files/17180382251.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f4730ef8---fubejejasisupa.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/30417954868.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/397ee7f1a2c397407f275d3cae67ff33/29312190248.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fuluwegabobivoxolusago.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/96296720542.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/36897455920.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee4569379---metakurixogoxavovete.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050314493581.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xijozegoxu.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/67657143547.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/funexot.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/wodofo.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/bifokulowebixufaz.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7fb24b5b2---51092587162.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/gijokovudisirip.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/36054778478.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1f8d1be4---gemepunuwuvojulizejozik.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1vmlb668pj4oaeiivhhjlqo7io/10096697897.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/55690977107.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jruk2nb0u17a88r4huts9lu2c8/ravesetobukor.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f97df9f4---lapeluj.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/58596703268.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad79009133---wujad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 11308 bytes
SHA-256: 563ea6a76db753fab1807448e76cd220a573c81bcbe354a10c0c2906763526f6
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 17308 bytes
SHA-256: a0d966b5a549d0065b797e66abe18a848d546ced33d99bb6f63b0fa4b2111617

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