Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3562f9dda00ac48…

MALICIOUS

PDF

99.1 KB Created: 2021-09-03 01:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37b3435ca24ea01f08b26a8d4ba0a6bd SHA-1: 44b812e8a04e39f318889a67c0e060c000e66239 SHA-256: b3562f9dda00ac4806c37b73923f33a73977a8f7300dfef1e8ec7443f915755b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/flma5t5psv1quvq6mg3p1ndl86/gidezudema.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8a30683df---matomip.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/68eb635abe6076e2aec8bf82b9798716/73785897269.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/82400669573.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0cf6c26e4---puwatedaravowapij.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/38949612399.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/79480606038.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a1a13ea27280ed1b778ffd4fe278ddef/rekoxuduboloxete.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202162649546998.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sapajafa.pdfIn PDF document text
    • https://pellevah.com/upload/files/laxiboto.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/93935095193.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/82901508302.pdfIn PDF document text
    • https://pellevah.com/upload/files/57127831702.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pawositilamuwuwiga.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e7e4caa2a---33322537720.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nnr85orcmkhg1p3ed6q30qki4o/37221951815.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d402ea2345---satowegozapakadopubepoge.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/mupewojelosudis.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb48c32fc---56486939498.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/datudulibosidonobo.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/nakusu.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/27826119962.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/senupuniluxifuropokuro.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b62c65a4f---94373199350.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/veforum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=anemia+hemolitica+no+autoinmune+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_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 19108 bytes
SHA-256: 294f746ce641a15a41ab7a8ac243c04e08406f64ebcd39a9c4c72c37828d94f4
font_01_sfnt_off00014c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16464 10696 bytes
SHA-256: 90691d65f3614b218e3211fbfd082de4dba4496dae5541d1885fe18a0c9dd9af