Malicious PDF — malware analysis report

Static analysis result for SHA-256 d176601d209aa30b…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 19:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fb0cf3b971ee93e070c3f1e1ed4cbc0 SHA-1: 9b9d244735f17a1969a49d1933f32f5bf93481ff SHA-256: d176601d209aa30bd9054b5a1d64129b8a1162f57593a8c5657f5fc56376c35d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=kbc+registration+2020+question+answer PDF link annotation
    • https://cdmsig1.com/ckfinder/userfiles/files/56222718006.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/94344768846.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/91476645892.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/6qnel1bdt0rg8f0glbpdekljr9/giwasitugiboboxemofuko.pdfIn PDF document text
    • https://migger.dk/userimages/file/gilalirurubazagopaliv.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/snqsfo94l49edv5quoor14kco0/41222040506.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f7213ce02c8bc7dc659afab22bf71d21/tupesifigaropileripuvaj.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/02e15b513544a17e2e1e31123cb0884f/33868638105.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a283c06230---85838184375.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/91911738530.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609060a2da541---8018299244.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wisumewefipujatutuluj.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/pikoguwotularumi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8478718ff---13674679999.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff895feac---45417825084.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/23921189109.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f3425880---nojipezili.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a002b0de227---bevakujojumefevobivisozi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096baebb5f0c---36948834143.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/ridefowafisa.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210530124317706631.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c5425025---rodogukudowifobina.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/12494595042.pdfIn PDF document text
    • https://btegypt.com/file/mugizinotorevurimobokaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 11064 bytes
SHA-256: 40e6b6d7413ec3248436444659fe4d51ddf7a0ca4383a97e48f2f7948ba77848
font_01_sfnt_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 17416 bytes
SHA-256: c94f416a76b9df491bb4c9c0130a029a94704ff0dc5ca21a86e47cffdd3e916f
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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