Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8745df36eb3747b…

MALICIOUS

PDF

81.7 KB Created: 2021-07-07 10:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b11f5ea791eb6412525764802aaf96a4 SHA-1: 202e679dc946ef035e26e860d999006b932b67bf SHA-256: f8745df36eb3747b7132583dab87b1dcf9c292fc2c22e7a052e33b95a435d19b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sam-global.info/files/file/mevonedafepeduxonuzodudog.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/734ef6c01ae1d85e9c7b7f64db0fdba7/86522591518.pdf
    • http://airsoft1.ro/files/file/88396348691.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cltk1ip4pdfqgmfodj1k5sf7bg/bivopexidaxirakepewubeziw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584961267e---98793915604.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/sigonagupuvewalotasop.pdf
    • http://a9188.com/upload_files/art_files/files/20210621_070932.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e7d01bc7e76734c33f303e14910ed5b8/4129626317.pdf
    • http://ekolojikweb.net/upld/userfiles/file/maxowanojesuzoxet.pdf
    • http://geoodwierty.pl/files/file/doxap.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde697945e---53425779038.pdf
    • http://sattosushi.com/uploads/files/vidovoni.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b6b9e033---funufobawutaxodufelis.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/mibo8sfj93e79fg6jj73a4i4vk/76270644312.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d2392f68a---58824262079.pdf
    • http://ranagro.com/files/65211496668.pdf
    • http://techbis.pl/files/file/91031896933.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7a0903869---62976015405.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b99fc2a60b---85303484971.pdf
    • http://parkwaywest1974.com/clients/861606/File/61315013766.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804efaa8d17---towadesos.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/45014523151.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520130930531131.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606febc5dca9a---dowore.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/db73778f6e8ba94c75e3ae5ea43cc5f9/setuti.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a24dd7f89---jonisi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=subject+to+change+without+notice
    • 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_off0000da03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16792 bytes
font_01_sfnt_off0000f21a.bin
794c83386319c98b6cfee7e3666d9d13901f2b7349db06eac563da21ce630aa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10728 bytes
font_02_sfnt_off00010abc.bin
7ff95a94d1eddf71da0b1e6be2a1239aeb68ce8933c180f3ccd42518706cae7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 18448 bytes