Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d745276250e5f7d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 20:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d4decfa666ec3e23667d8128f8d0fc4 SHA-1: 2e35940a712a6276b55426d996130b551c0a9de5 SHA-256: 1d745276250e5f7dc715b793b61dc4e2845aaff2bd73beda264d318382120afe
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The presence of numerous distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6p6shp361t16g49s1d0g73l174/nitaz.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/d4u5jf1abtlaskjsk2th5cbbeb/58049637048.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b0ed29e8a01ca99e61e2313d37150611/41402738177.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/709564d9700de11b0f37e338826f0824/31634326192.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jozuvogiguruxerikekepix.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/vejik.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e30e5e1ce31---liguvufujuwubuvorarinidog.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/lrflnbce7kn2rgpcsg2c2j3gmj/farimufa.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/puzolowifofuvogeb.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-08-29/images/files/75510817750.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c93752a3036---wisoxurafupeguwo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/5d98d6099de417f69424970834389ea4/11031780076.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/narivofono.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/a765kj4vl7nsiob1ucg3j688d4/gonevudalixowojikoxe.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cfce0fb7---mufak.pdfIn PDF document text
    • http://entrackintl.com/uploads/suresez.pdfIn PDF document text
    • http://sun-tes.ru/files/file/77532722551.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1694806d6a5a12026cb236092c40a0ee/memejukemazemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=anglicko+slovensk%C3%BD+slovn%C3%ADk+s+v%C3%BDslovnos%C5%A5ou+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_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 10984 bytes
SHA-256: 4fdb8f4210ffbcaf5daac5ff8f1185c55ae9d1f3e6cd4905aa371a14dff15922
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 19284 bytes
SHA-256: 617fad0d08a121930fc9d36d6e2b10a758584536ed978008f5da4f219c0865ff

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