Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e12898c346dffc…

MALICIOUS

PDF

86.4 KB Created: 2021-08-19 19:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93ebb1eba43aa51302016a5cbf5bcd4e SHA-1: c2390ded9b6573410060a4c965834f6f95a11b57 SHA-256: 89e12898c346dffce4cdab671aec167192160ba1a39076c27c8c61d262ad7bdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM term redirectors, reinforcing the phishing lure. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/uplcv?utm_term=activity+a+moles+gizmo+answer+key+pdf PDF link annotation
    • https://familienbilstrup.dk/userfiles/file/tebagiloxudojowumebaguze.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d4c9b80056c513954decc6e125f32501/69096360864.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2910fdba---47277519530.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd5565efbf.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/41586724787.pdfIn PDF document text
    • https://area5srl.it/file/27120945338.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/nuvanisix.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/45515210533.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4a000e1fa63f27ec6063c1675daf8da8/vusivubawuze.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/jerekewusaxomet.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dc25b49aaf3---gomasumozuz.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/derabusejepatixi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b70a958a05d83f073c4b3eaf9838ff03/10272628724.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5facf7812dd79654fe697bac291de9e1/72884647470.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210816_105429.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/6809809251.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/didebewiwumumij.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/8442295944.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210816105243.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_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 17096 bytes
SHA-256: d25494fe7efb0e54e4803522e878f0e09fa4ca37d5a720e5d0e6126bd33a1349
font_01_sfnt_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 11360 bytes
SHA-256: a60796a108283f7eb60a89192bbf223a7d6d077fb4db8c362a80be09976553c5
font_02_sfnt_off0001330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1