Malicious PDF — malware analysis report

Static analysis result for SHA-256 579287c176026b72…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 11:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa12d66c05a4dab654fbafe110919311 SHA-1: b61ceef0d2348e930151c8700b00d72eac955f9c SHA-256: 579287c176026b72f53b7f934126e3ad6e9e3dddb4c060e385a2c0f889f3fe23
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://utuin.net/files/fckeditor/file/gogoguwasu.pdf In PDF document text
    • http://prestopc.it/upload/file/6660520987.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/20917294824.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/03a29654b570bdaa4e3c320e7644d40c/zawoxugufegaro.pdfIn PDF document text
    • http://carbontuning.ru/file/1153502487.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/lasopesaniwubogususejawuk.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/63519915438.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/jiwukixiwakixenizutugow.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/38952481007.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/10088707735.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33a77ff82---budeginesameb.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1239b3ca---27062733110.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908081751.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/xizunale.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/688983280.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/toxolexurixuwo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9e4159a9---pokobimasi.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/retoxerimaju.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/23923630537.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/30922766688.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dijepuxe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b4bccc231---38239723243.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/43484877654.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/bowuk.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/buxudajafezegurekesemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cara+membuat+film+kartun+di+androidPDF 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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 16576 bytes
SHA-256: 7da658ec52e91d30353318f6b254383ae95a85320e6f3d2c3523af0097d6133c
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 10708 bytes
SHA-256: 54e0b2ebecacfc40e39b9ba2468c8adca2f603a66b2e40b0dadb56090190fb5e
font_02_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1