Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a73dea92e8a40e1…

MALICIOUS

PDF

71.1 KB Created: 2021-07-08 00:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80aa49adeece11d4ef749c421e5394f6 SHA-1: 87736761e7120b96ed52143084b3a9cf741ed2ce SHA-256: 1a73dea92e8a40e13278848e230ca9264e1ba3fa398d8389703e93ae09949f8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to phishing or malware-hosting pages. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=henry%27s+constant+for+co2 PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6i4b0no1jvn9t1g8jpn0uri9c6/76399070094.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/74731591158.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd711ea489---bixitafumi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/234c0bed91a209409cb454df6332b3a9/vimekagenapibosoxirowavug.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/mirabakekivovolenadafagu.pdfIn PDF document text
    • https://windsbs.biz/files/file/zibapaxojenez.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e027265446534ebee465e0699f8f12d0/51644816495.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/7338806156.pdfIn PDF document text
    • https://yuss.it/file/jorifiporeloxotagalin.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/5944103859.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c61989eec32dc709615a84083eda3c65/92569986499.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa65a5303---40259290134.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/btnb69oimdni0rrhs08367sfmd/70887366829.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a87c14f557314d71b2898d2498f3566d/1903203777.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210609082422.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160808325a8074---43829832127.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb268738b---jepafejafalafa.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/lexenufase.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098754d21654---sesawuretanode.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/kijuvotamelak.pdfIn PDF document text
    • http://soles2walk.cz/data/file/14893447747.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff8734c14---selanaxare.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608832e9f24c8---109324942.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_off0000b61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61F 15792 bytes
SHA-256: 1f4baa35366b2628615577348710eed0eb498d947983a888826608605af24e7f
font_01_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10448 bytes
SHA-256: d3f80aa10aca232d48434cf62e5fef10ff2329e81c7fb7d8fe839de11e16498d
font_02_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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