Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2f544d44484985…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 23:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 673b995f60a7b42b0ff41440a0bcb04a SHA-1: 6f952369b19dc3bbce22f775c82dc4ad95f2fe35 SHA-256: df2f544d444849856d36d0ae8f8d794bd526f126e4913b36134a084d4e97fc4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_QR_LURE' heuristic suggest an attempt to trick users into visiting external sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://aow.infogestnet.it/ckfinder/userfiles/files/lanijabe.pdf In PDF document text
    • http://kingkady.com/uploadfile/files/pokozeroda.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/jobomapezuz.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/40377701191.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/10747210292.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/mirafuwo.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/33683754425.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/26943487150.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/11517926165.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/zugawesiwalefe.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/81131173120.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/82361641617.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/pibonomadizidafopali.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e5ae1332---42243792521.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/91668812469.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161357535a934c---debanebob.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350ce4b9e37---18383435129.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/53298952157.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/65794048572.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/31461788078.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/gowusofaza.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/36635726764.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd731719b---70117737825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+10+qr+code+scannerPDF link annotation
    • 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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 18184 bytes
SHA-256: e326c10bf8ed85148b72b110a93b13d5be0e9301a635a5b50e2dabc4b4633cf3
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10520 bytes
SHA-256: 0b994f8e33658699132e189cc1d35229ba4118974784b9662b13057e9f25421f
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1