Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc90bea2184e28b…

MALICIOUS

PDF

88.3 KB Created: 2021-07-02 01:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 936563154e1cd7c39cbe288a21b413df SHA-1: 9ba7d34bc7a5212602fd53383f4cc0965e10f898 SHA-256: 4fc90bea2184e28b691e9e548bbb882c9332fb2d368a35843a63ccacefffca63
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/mizezitumomewewe.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a923a376---lukul.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c24fd7163---mufokizul.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/265d6af536679bb7a97a1305916657e6/18874580721.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210614_0C076E536CCE0BDA.pdf
    • http://biolabsrl.org/userfiles/files/nofugavelorufenigonax.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/172b0f5d25d3e6ec524e7db23f678ee7/xelajad.pdf
    • http://islandpointfl.com/userimages/rugizapovesaxuvenipog.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/80280034782.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/40342788472.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/45auhpjct7t3pet0nmekgtrcnm/kuzedejagopavanatafezo.pdf
    • http://keacg.com/upload/files/60615380541.pdf
    • http://zaun-produzent.de/userfiles/file/puwadazokuzebevalejiwu.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/p4go3nr4cpubj02trh166d1dj7/81871401889.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e3e7364db1ac692ea22698c26547b6aa/49836300712.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8be2463b---vofupag.pdf
    • http://kartywspomnien.pl/uploads/assets/file/bukabukilawoxatimipopuka.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa75d5d9ea---jatibivipaxobinuw.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df1fbe23e---tuwaposuvax.pdf
    • http://animationcoach.com/userfiles/file/31558773293.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8a5ca164d5eb70b26eb3b5020d1232a1/lalin.pdf
    • http://animalscipublisher.com/files/upfiles/file/14719683267.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44cf44dc4---wipumujegefeva.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ik8addjrh5r9dqd095c62mi9s5/46768176682.pdf
    • https://lesura.net/userfiles/file/joburusek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=purest+form+of+crude+oil
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/365883467783e7fdbf4933fc1ddd8453/57881649953.pdf
    • 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_off0000f668.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16792 bytes
font_01_sfnt_off00010e7a.bin
fb38736f76e83ef8d9e8516f7cdf491f2981a55b91568e7cd50001f38ac28ee7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 17432 bytes
font_02_sfnt_off00013c24.bin
99102bc6062c23af99158056944d671a22abc06e5312fb2b74e3831a1d4d53b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 10472 bytes