Malicious PDF — malware analysis report

Static analysis result for SHA-256 2656a190037ad5a0…

MALICIOUS

PDF

93.1 KB Created: 2021-08-04 23:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44fc7048377e42c5d632a2178a268c19 SHA-1: 9d69284bcf8d0d1b69f8c2f40362ddf1d689009c SHA-256: 2656a190037ad5a0e15e0d84537763a6e4963ce69495a4f187b0d47d14d5b397
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The embedded URLs, particularly those hosted on 'informerfitness.com', are likely intended to lead victims to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7fbf9ad2501aa3eff6cb8bf034bb34ec/wusaj.pdf In PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1583c6e19c---polarebojepigofobe.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece8c9ffcf---48599515157.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/65983123836.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/manevu.pdfIn PDF document text
    • https://lavineriablend.it/file/forev.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/89958315170.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772434aab1b---33945490763.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/wubevi.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/kebuvuroval.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108e891f00b4---pekobifitalamo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/30up7igi9rlcsohmjuf6f27se3/ginobakisotupe.pdfIn PDF document text
    • http://beateromer.com/bilder/file/safevitumetexuduxamu.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/2567579969.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f98b8444208---surubefesudun.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/302bdec85716efea957c2cfaeeaedf71/60844093476.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/fagetaxofapeparuxejomu.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/dironodebubavi.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/90366474678.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/35388275183.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/47478451913.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/42086258807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+games+on+casio+fx-9860giiPDF 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_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 17656 bytes
SHA-256: 7da8b735bea60274be1e895e4c7db93e2c392b683a11c559523797322e3e5bc4
font_01_sfnt_off0001336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B82 11596 bytes
SHA-256: 5fa15a6e91b54506580bb4807cf37962e088bed2f63defd2f18dd946e3a78e63

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