Malicious PDF — malware analysis report

Static analysis result for SHA-256 8844c1ef03518c09…

MALICIOUS

PDF

93.1 KB Created: 2021-07-31 00:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6365795e917ef05d77b907f80808b0a7 SHA-1: 3b48386e9dd40c9fc90c1abe75b57c6b201d11a9 SHA-256: 8844c1ef03518c09924ac03940ea7f64870b8378f40281081498b533a071c8bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://drafthe.ru/uplcv?utm_term=bizagi+studio+tutorial+pdf PDF link annotation
    • http://cnex.cc/images/blog//file/32112626652.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/tutowowipuduxefafusazinal.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/motikikewawomafowepeja.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mojisibibuxobi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9f4b122f---zubugetidat.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/37051647420.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/37929823905.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe4ab99d28---tezunawowinevovabuluwazaj.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjpumsjien2i5asbbcbphndn4v/tedulevetozotuvowese.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/95230218378.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23da2569f---radesexam.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843a61c9b8---54937461378.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ldkevf4jjse93vv3l1bpuvbi73/9641257686.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8b544ef1f9100a15bf9ad5c4f634a679/wodupovaxusis.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e17a86800f2---62926032972.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/mugabonebufog.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/mofasawiketedidodexidiw.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/65efe6b3eede48cea2062dc144f16959/52066579459.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vatelakogunu.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/nikifewowupilobasuxaded.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/86400497465.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160f386da1fec0---19531247638.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c063995c2fd---99551255176.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/finawutekevag.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/366263851.pdfIn PDF document text
    • https://.bizagi.com/In PDF document text
    • 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_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 10652 bytes
SHA-256: 43e2e733330f81da8d3abfb87502d07ef43014b43cccd28fad7300079520cb78
font_01_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 17196 bytes
SHA-256: 6861a4df094dc7d7e699537fd050465cb3070b18be15b314c4fbf8bb56a3256e
font_02_sfnt_off00014d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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