Malicious PDF — malware analysis report

Static analysis result for SHA-256 67890f2a7f73dee9…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 14:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b86e4cfad87c9bcfe6b7395f71bf3e4 SHA-1: 8798e35b5930fe521021fbea438874667389ce87 SHA-256: 67890f2a7f73dee92fc7fa146674bbd66929f7d25896e2324763219fe9ed21dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on various domains, some of which are flagged as potentially compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristic and the malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vertracapital.com/uploads/files/90630931601.pdf In PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/77395169314.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/8416450597.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/27677239503.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/50888257686.pdfIn PDF document text
    • https://506hlapeta.com/files/file/waritibijinite.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/be9f6e92f65c2b767b5844650c14cf11/rofagerinirugazajadotexo.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/44211156387.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/ruliduvutubivon.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/10575918425.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/35417782839.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/4282387379.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1299a711---76599133184.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/41924261837.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139842ae4afb---tajofaximosubav.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/jevekovumilaneb.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/zabobotoxuvapag.pdfIn PDF document text
    • http://gapp.fr/medias/files/kelajunim.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/74973096883.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/metamixetazepugefojez.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/xazabesebozojuwawakujak.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131445fdecf8---fajifidizibon.pdfIn PDF document text
    • https://okazionche.com/files/86513198375.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/sidutubasosajedubefozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+chi+season+3+episode+6+123moviesPDF 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_off0000be51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 16520 bytes
SHA-256: b91311fea1914e41e7fe59800a9a5e08442ca3e3207de3a1dddf2d8fec939e21
font_02_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 11076 bytes
SHA-256: f5151a59f8c2f484213f2720cdb6a1677491aee25deb7591a2fd23477fae5be7