Malicious PDF — malware analysis report

Static analysis result for SHA-256 a668b38c0ceab782…

MALICIOUS

PDF

94.4 KB Created: 2021-07-01 13:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d364afee904791ef78178c3b9a860a4f SHA-1: 877afca3f464fdac64b85a22ff77f86ba9b520dc SHA-256: a668b38c0ceab7820ca2e7f9a8204f029186fffe7396fea1a85a6deac547c1bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://drafthe.ru/uplcv?utm_term=weathering+with+you+vf+streaming PDF link annotation
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2119beca7c06ac9cfcea20da2c6029a5/misumabatosonafeme.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/59035848794.pdfIn PDF document text
    • https://medtek.vn/storage/file/22651850138.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6e6ee99d7---89826547276.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/debepexivaxolozifaxa.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/7d82aca61013b37db100f928394c4288/66863712735.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9e12c9ed---14999519407.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/rebajuwagowuzizes.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a301735f9f---fiziduvax.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608169ce9bdf9---87824772469.pdfIn PDF document text
    • http://fittbikese.hu/files/file/62517029660.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/fujdlbkv48n6o9i5b6ivl2gla7/zapolara.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/51335435146.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/72843806271.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93c89c334---67982328912.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/toxozuvivepakadokam.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/97282116748.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d63fc13326c986e2a3f8a23e127bcf3e/basepokuwujubixotira.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/81ad3edcce37577b0f27c0acce030499/tatuweba.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fa2a6581b534f98cc2b72683dcc6cc71/79271298912.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/1864049348.pdfIn PDF document text
    • http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/digalozetediwe.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210523135023_250894562.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fcee25dec---46461476755.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 10972 bytes
SHA-256: 57128693b0e2a22a06de835e636fb0d7c0c3b21d665c85b3d5e183a87ec21c52
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 5172 bytes
SHA-256: aae2423e984b017f923fa76a0cb3485589a314fa3f737eeb694737d9d207952e
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 19464 bytes
SHA-256: 67825c663fbbb94a32fd423a1337f5ab4d3a40f455b6fe132e96b0ce0313c52f
font_03_sfnt_off000153a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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