Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dd14fe1fd9c75b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 11:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d22326a9f4ae278df154f9ee3cac69d6 SHA-1: d10a03de29eaa238567725fdf8192ab71e0ef6c9 SHA-256: d5dd14fe1fd9c75b4042a9d1dfa0c6506aa1e94fbdb567142ac7627c8ac98db8
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. The heuristics reveal a link farm structure pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple URLs, many hosted on compromised or potentially disposable domains, reinforces the phishing and distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/45427723957.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f965d8d4ac---puwaferelim.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b4c061ca78cbff09b8dc3c3643f8f54e/doxusi.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wafexubagewasededowar.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/gukajadilititim.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632187129.pdfIn PDF document text
    • http://email-database.info/userfiles/file/73738304321.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922161339.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/lafukasikidikawi.pdfIn PDF document text
    • http://sbcnepal.com/images/file/17332166775.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40d24626---67459764563.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb96470fed---92888015446.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/3717162082.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/45797280517.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/759939124.pdfIn PDF document text
    • http://etnorom.hu/pictures/39398668760.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/48100227254.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/51962092660.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/66606665852.pdfIn PDF document text
    • https://dukupahit.com/contents/files/gopozaxewow.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l6n99bbmn6jlrb5csmoi7osj0m/55661917658.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zitajilurokir.pdfIn PDF document text
    • https://apra.pl/files/file/30772976068.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/81098329058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+android+studio+sdk+for+windowsPDF 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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 10496 bytes
SHA-256: a8e64a44132e726b839ad80d1fffaff8e8cecabde5df29c02ca2a23b938a7eeb
font_01_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 17004 bytes
SHA-256: d54d0b718d5b9c81ad18fe1ac8991d1b7886b02546939dd83f9f48ca05ceda69
font_02_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1