Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e2d6b21a33a259…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 13:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4eb3d7700070f79164dbada1255fb1c0 SHA-1: 0d7482108f322859c8019f0667d7b722a81168a4 SHA-256: 33e2d6b21a33a259687204005a02356769d890d37b835343bf190c0d580e9d2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://centrons.com/uploaded/file/344535236613b1dc58029a.pdf In PDF document text
    • http://lobanowscy.pl/userfiles/file/pimunimobepijikesina.pdfIn PDF document text
    • http://zimmerei-possert.at/kidejekupojuferafiwotib.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/42764396080.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/pegapozotil.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/dubugelorozelepeju.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/39ea0239cfea0de91d381604ba39cf1e/jiliwapori.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/59874302957.pdfIn PDF document text
    • http://hzqzg.com/d/files/fetutorusozizawilev.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/kezajomalakakidop.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/nazozijenunopapeja.pdfIn PDF document text
    • http://www.pilartangguh.com/file/88835569468.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210904_29D43234EAFD9DD9.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/71787955991.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/55082032466.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161376c94a90ca---bodavi.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/girurudetuwo.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/75420638872.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f57f8b1f09f0bd1ea0f02a0823803738/90874100136.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1af66bf24---zubev.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/beboti.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/jusewalawedipilug.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/28070282838.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014c601e33---94797578255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=streaming+film+wonder+woman+1984PDF 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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 11196 bytes
SHA-256: e17af471cd43ee7726a0a1cd0504890051f36ec4012d81a321e79e9058bae07a
font_02_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 19104 bytes
SHA-256: 875fe035556eadbc28276a31266a90f5b188ad3aa0a2f2aa4b99afbfea570680

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