Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37833df42e8ccb0…

MALICIOUS

PDF

87.8 KB Created: 2021-07-01 18:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 74e8562f91c675f12019f323d08c3f70 SHA-1: 02b18a82d766cb4132f6a2ee5ec9c45379ad50a0 SHA-256: a37833df42e8ccb087896e9dc791e4a9f41476d2c22b22bfff5ecf541c53395b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs and the nature of the link farm suggest an attempt to lure users to phishing or malware distribution sites, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8a8e675f9ec3b36ed58251644231b923/13117992702.pdf In PDF document text
    • http://naplesredeals.com/userfiles/files/mupowavin.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b9f99b664486c15d09f4a0c6e68a7d20/zunanotukeronikipililam.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c2ecbabe---nomekuze.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/26308295957.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d41957c4---81883961616.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gewevifupurajora.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ctuk4sbf2e1c429fcekt1cq9g3/golexozururiwunusakodofux.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e7aac13d---zonetevexunumo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608394ba618bf---75142510922.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/rufafemepageroj.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/24000575468.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/69668302893.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074c696b83de---70529210918.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/nekifukorolonuwax.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/fidasigimobifukizusole.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2047660645158fdc8aca6e5afb9e9f53/nepamiginepupijakukazal.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/786a119a7757d389685bb801ef6bf45a/24032606766.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/15045712041.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accdecd5d48---wupapozumewewane.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/44878301404.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/92433871149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sister+watches+me+jerk+offPDF link annotation
    • 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_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 10832 bytes
SHA-256: d4f204075c2a12ffa9eb5a893129ceb4a9a1943954bdd46de29ed4b37967c293
font_01_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 17304 bytes
SHA-256: bca9b6d8cfb749867a292a1a4e3076ac6df8e159d6f2e3224fc96a900f85fa0a
font_02_sfnt_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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