Malicious PDF — malware analysis report

Static analysis result for SHA-256 b767d352222af8b2…

MALICIOUS

PDF

73.7 KB Created: 2021-06-29 11:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fdccddd3caf0f027162f2546432eda5 SHA-1: deb549cfe8a1931d3333d5c4787caf99cb882ecf SHA-256: b767d352222af8b2c77186cef0c90374dae3dc8489c34b273e195732353e8fa3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

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 http://slsnn.ru/content/file/ramidibiwegev.pdf
    • https://kund-in.com/userfiles/file/fabusimoxojix.pdf
    • https://anukulagrotech.com/userfiles/file/46362513498.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/teletupepede.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa49b6a167---dodizepuzugugelunixu.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160893cf9bb2cd---12376766064.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ed4ffa4ad4ddd746e85d0b62315df958/65963592546.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a9c2c616e3---pefutipirukanajozekepob.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d0449b2e1---385771905.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d295fb83fe---favugifolegowo.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/27614b5013414bc8a8b7a1654065a5bd/matuvaxirokasuzokotivo.pdf
    • http://aihyang.com/userfiles/file/80902490076.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/830e407d81fab1028c5a54e527a92822/gozubajarawolilumixojon.pdf
    • http://op-gold.com/ck_image//files/12476626031.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/re2la9rh06v6hlb7ra1mddgsr2/89856258448.pdf
    • https://anmoul.com/userfiles/file/47211535092.pdf
    • https://ph2020.org/ckfinder/userfiles/files/95996462761.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hovsnlf9qa76hql4m1kp4o5n6g/58210819802.pdf
    • https://digireg.it/upload/vuwijopezamo.pdf
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/wunavedivuloxa.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2bme5lm5p3lp1t0ejrtng8hrd6/kikumoza.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/govisurobupoleburowof.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beab8ea6628---58594265685.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474c2557ac---vuwazopokepulila.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/56lni38hk85rngjdusv3esihio/64306068423.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bobby%27s+sewer+and+drain+cleaning
    • 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_off0000bd50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD50 16792 bytes
font_01_sfnt_off0000d567.bin
07870a15020706670cf4575bd11345ae9980cff3c0327e8aa8ab9c6effc97489
pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 10876 bytes
font_02_sfnt_off0000ee94.bin
d13832d80598528cd87d84405d44a53ac40230ae1df607311ae86e7d50a1d206
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16476 bytes