Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2304343e78f941…

MALICIOUS

PDF

87.9 KB Created: 2021-08-21 21:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a3d85d37e1b6ce14f7eb19ca93d9733 SHA-1: 60b13a9a48ce7d8fe431e359276e0327e8fe068a SHA-256: 7e2304343e78f9414118ce493239f600b8e03296bdee81affb5bbbe0e37e7680
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Multiple heuristics indicate it contains a link farm pointing to external resources, including one directly to an IP address. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c27a30c9c---zadatetogawomoga.pdf In PDF document text
    • https://ivanamihic.com//files/72882905615.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1a5990c10dc3199e52dcb40322936dcd/99946514799.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/add7cb232db9f3c3d449990f91ee6f7d/dupigerukosokikuravipip.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/damolojizigipisinan.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/95798885692.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/258e4fecff92a3f843768a0bd8bc3e05/56681519626.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/acd0c44f5604b332a12a84d8058d0d24/guxiwalowapebimev.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e13340a39---71127433376.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/raxujarenomajut.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2c7113c0---sawowega.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bedemiwesagomijuj.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/mufidajijofer.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/75025004169.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a97168fc4---lisikekafezeferavezuz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c1465895---41508083146.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/wevoj.pdfPDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/cfeec86ddbcb318f2dd474ee2d6e25c8/86024893016.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/94353463090.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/47d974b0ae52c67d6c0ce21ac57c0fb6/lufajawenalinidelamufuno.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/pajok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+times+what+is+1176PDF 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_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 17336 bytes
SHA-256: ac9bb968614b44078c76b971f589ee265960598eb96dbd7bb3e07668417be27f
font_01_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 10352 bytes
SHA-256: ab1471413110bb3bfae6f482d2473ef4e79f66dc6ebec587356d32d6c9e978f6
font_02_sfnt_off000139fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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