Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e278ee37587fdfb…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 00:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4b932ec5703a70206993c7bac1975b2 SHA-1: b9add08c1fd359b43e4c169f691e809b37ea1d44 SHA-256: 6e278ee37587fdfbdcbd8eba95b13b9e80e6aae676509e5b2eebb4fcb50dfb74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous embedded URLs pointing to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8ed17ed0eafb3767a39168c26514b6a0/93149486426.pdf In PDF document text
    • http://nc-israel.ru/upload/files/nofexiwunumog.pdfIn PDF document text
    • http://bearings.vn/images/ckeditor/files/kakezumegigimolusamevuki.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/pinekajiburibima.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/dodezenataponojenufem.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/60394691143.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/zilikasemefetajitiwirak.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/kisibagu.pdfIn PDF document text
    • http://aven.su/userfiles/file/xezikewijivexejopivoxe.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/zitulomifo.pdfIn PDF document text
    • https://conrays.ru/f/data/64079328549.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/vaviwijokugo.pdfIn PDF document text
    • https://norservis.cz/files/files/44778473652.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/pifaledewafanipimivevero.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/75827463313.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/5758553106.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/murujugoworedefikot.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/diteselugajozapu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/efd8b1675331d426be2c98e5522f7e0e/xivisegatuje.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/713ea55d13addc56376b62be37ae1e1c/77300801701.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/jejujegorinuwalalom.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/90086011168.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/47262456650.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/pasidafutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=where+do+i+find+my+sd+card+on+my+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_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 17476 bytes
SHA-256: 34c6f6bf40c105c8736e85c30d8ece413e2dc2c7f424e19639633a575dc1a9e7
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 10704 bytes
SHA-256: e5d27cd63160a3fbbb465cfa769085d71688a97645fc22265dc89ed7fe76790c
font_02_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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