Malicious PDF — malware analysis report

Static analysis result for SHA-256 a529e83ca9f4f562…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 13:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4521ad2ff461510b461860bd6b4c3253 SHA-1: 13a0efe0b27e00d2bd450a83bd69d36c09822784 SHA-256: a529e83ca9f4f562542e58d9f46468231831bcdf775bc03faefe36b7b6fec9e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine rankings or distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coming-c.com/userfiles/file/pofebubakezop.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097622c495a1---nuvopapudomonizepar.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da8c152b0f---xavagedosumed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cab09142b---tokajitedidadaxekesivit.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/xibivakomuritirezapubi.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/78440255505.pdfIn PDF document text
    • https://lesura.net/userfiles/file/70474579485.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/satisawanomi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf517563bf---valotaselunuluvowifimena.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0f173d2fe---puzukojivabeve.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/zitevebonojix.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4f1aae4d7fb0457201e1d73efe0c172d/sikusexerigemirub.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/54343954614.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8732938d11---basiberivekaf.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/tikawitesusopugo.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/fikapepajoxebar.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/49084813837.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c562e1992a8---58239506540.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/61572413605.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/21658996066.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/wufarelenuzinufufidisufu.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fakiwezisimerarogumebow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=knight%27s+modern+seamanship+18th+edition+pdfPDF 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_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 17516 bytes
SHA-256: ccc133e80a4437e9f626efbdd696bc259a63fe59edc4ef1f20b5093f05fa8a86
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 11184 bytes
SHA-256: ab2157760bd64eb9f1612cdc2f525290fa830083ee8f94479e517d367b588eea
font_02_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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