Malicious PDF — malware analysis report

Static analysis result for SHA-256 af44844ccca935c3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 15:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cf933d072584c632a509eea3a6deb17 SHA-1: e9df90ab6d6a65faae9d71f5c4dcfb1a77111db7 SHA-256: af44844ccca935c3e7afb2482cba749fd1a7e6c0fb8a3ef5fbf54a18654d25df
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://soudurelauziere.com/upload/editor/file/31409542225.pdf In PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d022b924900---dokerozitumododaded.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/30873288618.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/kevetuzuvomikenokowefibo.pdfIn PDF document text
    • http://premo.at/userfiles/file/43655881021.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/98542936482.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/2820523401.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/venneidmk49bdb12mnit2k2k11/movikedaliwo.pdfIn PDF document text
    • http://proxima-design.cz/files/file/7641647531.pdfIn PDF document text
    • https://dafelia.com/files/94985155604.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c008fb886d---kumiga.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/5062526136.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/is2ds05a1qq8qmsgmjapj89rr7/13249502032.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/26pcc0j6dvhhgnlt0105sfgqg7/34431934345.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/tozilutekutawejimosorofip.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1585b87902276f2c950af28fc7096459/19586140159.pdfIn PDF document text
    • https://coil.hk/upload/files/75137021198.pdfIn PDF document text
    • http://nature-revive.org/files/file/xazuj.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/bonejom.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f99004890da4b3fbd3a081813189f1d0/66295330346.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/db090520b8d667860b0a420db6ba0d38/9073361624.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/pixeduni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=physiology+of+the+kidney+and+body+fluids+pdfPDF 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 18692 bytes
SHA-256: 1d4c5703bab3b6a067572f98945517d06632f877f282fba673205276d5e5c4c6
font_01_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 11124 bytes
SHA-256: 7e03fbd73cec8a4d3064d2af1b59be7e39f4317705ceb3a6dc76e9fce8f89723
font_02_sfnt_off00012d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1