Malicious PDF — malware analysis report

Static analysis result for SHA-256 691167f5bd0b8ba1…

MALICIOUS

PDF

147.0 KB Created: 2021-07-04 03:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c6ef933c37f1136b5fdfa2a5f5b86e92 SHA-1: fac99a9bacdebb7114f21e8020fc4231dbccf97d SHA-256: 691167f5bd0b8ba19548ae0a8035207e7d170fe617c8dd031b8557839c7725ab
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/8ad12514c412624a2834c2240148af04/doneneposederajuva.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b09a88be---67898788898.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/50525722062147216080c67e69da53b4/nasukiwagisimaxijexogo.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/24371283981.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe17636d4---nubipokubuzegiz.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t5tl4kbc4vt2tuhtpp454t91m7/17279691316.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b8300003---gidinifirerojajetisomuza.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ot4jb0p1rtkfmkp9rnd9us7n30/15792164971.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b9893ffd99fa72eca832bfb2b8a73dc8/99865461329.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f17ee5bc---tirixuwoxasidizafiwa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf9b51100---54516082766.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e79c749e624861d81a2f5ad8d5728487/rotoxi.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/88669861091.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/46655631397.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/dewazimirajivezonumuwof.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9573c91a1---sekenovitotekuzenor.pdfIn PDF document text
    • http://schokobrunnen.com/idata/38929511973.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9e2ee503---fegekiwozevewezo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a611719d8---72636368596.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5bc36a1a---xipovodebewovizimukut.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zefonifawiwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=you+are+the+light+of+my+salvationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8AF 20476 bytes
SHA-256: 95e464142682da31c94834a6dafc84431c29ed3c3b1ce15ce4a079ac6b41165d
font_01_sfnt_off0001eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB3E 10924 bytes
SHA-256: 626193c19e673c9387d9a8a8b7cae81b36cfe0a36e2e3150af45fa12548563f0
font_02_sfnt_off0002046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2046B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00021c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C7C 19424 bytes
SHA-256: 0be6d3ea96e979c0a148b689421a487ab0e3da130e85e89e3dea40a3013bcd22

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