Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae51db9bbb9b804…

MALICIOUS

PDF

87.2 KB Created: 2021-06-19 02:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4c4cfc280dce007cfe93f184f951c1b3 SHA-1: 33c88a293cb246a246f22a65bb4390397ec6b8b8 SHA-256: cae51db9bbb9b80414b8852fe4c2edcc06c7fb373adc2af3a2831ca146dcec30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple suspicious URLs suggests an attempt to distribute a payload or redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fe9327863e9ecc5f3833034e03cf60f8/xoragoredomaz.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cac793aa180---57807945113.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/51241570450.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/85019a83271f8a52b4ef4355fd0a0a58/60176959034.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/titiruradudawojudoredoxu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/84023934147.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/23/file/20210523_102343_122.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ir297tpvadvttgl5g5mm244noo/kidodu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7b6672a24450877827b9b54b04d9367a/funabivonaxotaf.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/25928064980.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c3a04dc2ca34ed94556513323ba6b31f/rogigalov.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/tikibevesuxojazuzizujexi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/jutibawejamuma.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/92219901019.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b869898357d---xerigogotupowapevakaluxe.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/63576380348.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/zozokinekurikebozad.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kuvodijefojikuxibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+mockup+polo+shirtPDF 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://scripts.sil.org/OFLIn 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_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 5468 bytes
SHA-256: 4c798b2e74ab5bf8e563999bd4f12c9b267d46c98ffe8270de594ff3b059aea9
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 13488 bytes
SHA-256: fb6c2e6e6be8ba4d43bd0551ac1a229f6428a2a2f4e089d448884924c9e56c33
font_02_sfnt_off000132b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 18164 bytes
SHA-256: 39ecab6f6ff505e1e160fe78691c1c31cb2078c9e397f9276194d201339fa762