Malicious PDF — malware analysis report

Static analysis result for SHA-256 57563887bda1ad07…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 18:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cfaa51f8445c07f6915f106970fab5a SHA-1: f7043c2068c7e4bd2de92c10eb3bc83edba6f8a7 SHA-256: 57563887bda1ad0710285fcc3cf0a4dd3edfccb077ee8f6b1239aa66029c3426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm used for redirection. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rqg55abtrfi97g5sfk70ofhtv4/7609808304.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c426af33bc1---50568197922.pdf
    • http://montazerangroup.com/uploader/file/73999701872.pdf
    • http://sotel-perm.ru/site/file/tebupudifatof.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/tuzobajowivuzavofedavipiz.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b727c0a8---29943943490.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c002a091c6e31fb1dadc4c4309304e9/16650927314.pdf
    • https://tomorrowhubs.com/upload/users/files/10790525157.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4dab50ac---zerosopapibizexodegiwexix.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/wejibipemipuf.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c2eeffc76971b5ceee00b3b5fd08c3e5/23876372069.pdf
    • http://allamericannursing.com/userfiles/file/44643295731.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2a1952669c43854cc72feca0ba0deee6/9173041522.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vc6seljpagnafcaj4ieuti3sf4/23715782945.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abff9552976---96880408690.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a498208f---kilexigunapusisiwe.pdf
    • http://amphorabeautyclub.com/campannas/file/fematamenegalil.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ba0d0df97ca3867618061dbc10d78c5a/46117302938.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6bff402b3---99965865334.pdf
    • https://gomaihoa.net/upload/files/15224542716.pdf
    • http://curry-box-deluxe.de/userfiles/file/60565229388.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9cf35ebb---55435226620.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7642eae5289e94af983d82a16c8695c1/genuvotogelikupuzapo.pdf
    • http://vizugy.hu/uploads/files/sivebedabubalovisu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=one+hour+blouse+stitching+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 16792 bytes
font_01_sfnt_off000105a7.bin
27cf6e8871e559fbcfc2bcb76532cd2fbc3a3347b565e639ada86da72333e2b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 10944 bytes
font_02_sfnt_off00011ed6.bin
acf702a80bf303c5818a332271094f028b2ec95bfadd2e6fdee2a59aa6df6cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 16532 bytes