Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b89dbf7095b2e88…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 12:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41af896cb223df6ffb15d75627c135c6 SHA-1: 6b8ef6fa60360ac837987d9ef18499328f62e7c5 SHA-256: 0b89dbf7095b2e8876caad9c179228a3cb556a17abecdf8dbd3368d2516fe856
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content, though heavily obfuscated, likely serve to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://oniceh.ru/uplcv?utm_term=difference+between+correlation+and+regression+in+statistics+pdf PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e393f0b7---majebinikog.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160762932beea8---38225924474.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6c5ca4a7c437deb5397cfc336a77965f/39673650664.pdfIn PDF document text
    • http://hydrem.ru/images/file/galufa.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/99128196491.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/91880178798.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c53c8aeb4571d13bda69092598496376/pewudejawi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/5i5d8rjm2826p7jun60achulu3/worosatas.pdfIn PDF document text
    • http://jucal.es/images/file/31812481076.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c859c6e7---20892993234.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/465005f1649dbb8f4b85cd423dc02b37/muvanuteno.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/jijarojojuzujezefifi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/49703607454.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/b34gcfdvp8qbc5k2hm0bsf6ug0/xafag.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/64169396201.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/biwosok.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c165026fef---20443710847.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dixejomiwomekobabewi.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/94475351181.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xewubazegudukevumevo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607676716fdb9---volivesav.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/dejimaxip.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/66050537826.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/136bd0bbf7c6a1a6f1f84416e8644bd4/78342483523.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071411163cce---46699739874.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/8785642107.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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 17620 bytes
SHA-256: 36de9c792f9c3231f226653ba9d908b492a0cde9f76af284b6f9051ae10fffb7
font_01_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 11020 bytes
SHA-256: 8a0059a0843717fe6e9b2c04498b7e688911de83c30ae0667f93929c5541813b

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