Malicious PDF — malware analysis report

Static analysis result for SHA-256 41089aad7f4f21dd…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 05:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a18b0efddba9c213f286af6718947753 SHA-1: 1d4bf6d1c6178ead879d5f781870d388ebdff45c SHA-256: 41089aad7f4f21dd713a845d1ddac632212ba83787fac9632a9fdf6b3ee64c00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://heatingboiler.ca/fck_upload/file/jajufeke.pdf In PDF document text
    • https://areopag.ru/sites/default/files/uploads/60139665524.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3cf1c52908f21da1dc32b554c3288864/rekubemokoluj.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/kipaxololipev.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/45003363412.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/90954650299.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b358f537---ropefulefupisuvominezuno.pdfIn PDF document text
    • https://scalping.ir/data/files/file/30812105938.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee36dc26a7---49494448420.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce906ef3aee---12660277789.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/cebeb27ab13b93f609a7164278527e15/52653722031.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/jedojejelefavam.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a6bae2602f3a9b1bd57d8d0ae9df6c6a/retutujipupepomefon.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/gazizozanutu.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/mopigu.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/gevot.pdfIn PDF document text
    • https://ismart99.net/upload/files/88523050508.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/piwopewamapisin.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/3441605625.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/11097855446.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/33794955132.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/ginajebimidijexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=funny+drummer+quotesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/030edd1ce5b2a5b5ec59a0063fe7be27/wokepit.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_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 17584 bytes
SHA-256: e053db0f15c76e165a9a68bb07e533a1df36f83ec20a3c75cc68841608c10b24
font_01_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 10448 bytes
SHA-256: 5ae797c7672077ec8840ceed50300271bd698d5772e750afad83896e7d13b6d5

Open this report in the interactive analyzer, or submit your own file for analysis.