Malicious PDF — malware analysis report

Static analysis result for SHA-256 d154732ff3530149…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 06:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8e612de9485731dbc2f06d781b48494 SHA-1: 180438eeb38d00741d92650cb5700edc8048a4cc SHA-256: d154732ff3530149d2070cec5d4cd6890bfeb8809416e003ab2426e242d2e8a6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, which in turn host other PDF files. This behavior is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8fcccd52---fekumofemunale.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fcddc81205fe7cfe319092d84e3f0909/nerededeponowujosokudobu.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/17024798450.pdfIn PDF document text
    • http://teifsepahan.com/files/file/bokiposolafuxeveduto.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jgcj6klillnc69lhor7n3ahj12/mapotularodibu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f424b4dc3f3a55301ec460f8e7458360/55811742541.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02186ccc34---jubijixonexuvolabiforo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/lj2m61flbvfl8gb585fj4qrgf5/20982444174.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/06a4bd48cbf1d9b35836080380da20d0/74260904286.pdfIn PDF document text
    • http://becucci.it/userfiles/files/56779113163.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/fafunozigowuzanipofujepit.pdfIn PDF document text
    • https://iwistw.com/upload/files/jimexuja.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/171232997cb87d9b2b30c2f24bb3d488/rerugamadepefemoxefux.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/surosi.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/kogutunopev.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/49c155f0fca6765f3ccdd9e3b467c6e1/pivaj.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a05bd3fe---menirijimizegogujekadet.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160808b74e47a8---rezibufimisufuxuje.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/54e19575146d843ed79575d6d6770f03/96196875873.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/64941515200.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/rutikaxim.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/375imib9l7fp1hiocfnsrrre6k/debelu.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/95644032794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=better+answers+formatPDF 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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 10376 bytes
SHA-256: d9a4c2e99d9030c457b8e7986e9ca5346f8537c246552f67705766bd88e76d33
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 17552 bytes
SHA-256: 25c118a65b31db7711120ff5aa91a20df658e79b3c50a3593be907a1b12c3965