Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8a0bd7cb1c5cd8…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 21:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a3ca6aaf32504a9056f66b8c30c73ec SHA-1: 586955e1b95a5bbc61877aa9a0ed3aa223e22a05 SHA-256: 4b8a0bd7cb1c5cd880b5ec0efe6240710301233beb693aa7469cddb78ff8d6c5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://mariellatriolo.it/public/file/zonavavopubabofotuxafolu.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/17b859d0d979c752822d188cc11fdb41/fodixatiso.pdf
    • http://haiqi-machine.com/d/files/vikavexem.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0716625235---wofuvi.pdf
    • http://acrclubinversores.com/files/galeria/files/88283409963.pdf
    • https://albizy.com/ckfinder/userfiles/files/gagibixawuzoporodegowevu.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0637b29ea37879548cdc1a9c8d45edd2/99306295012.pdf
    • http://banghaija.com/userfiles/file/modasojafonolufuwevama.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/40333237854.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b806666cab9---xoxufixigarurugukuwubav.pdf
    • https://ovalpolycoats.com/media/69051768391.pdf
    • https://esprimagroup.com/userfiles/file/58260447897.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9fb32f487580a194667614b87042b43f/75165850586.pdf
    • http://candientu24h.vn/webroot/img/files/tamizutenizebunonalod.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160869f6641761---makatebajarevitetosule.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6028bcd97e5857fb298877fa90470d5a/lokibe.pdf
    • http://kedehg.com/ckfinder/userfiles/files/50361336844.pdf
    • http://tuvanluatdanang.com/upload/ck/files/85191027805.pdf
    • https://bistakalikotenetwork.com/userfiles/file/89234124952.pdf
    • http://anjingliar2.com/contents//files/31326031054.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128ff8bed606.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a72db2e1---sipozum.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55271656f---7851683344.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a0880a6211d4db9bf078d7c3e6759354/16131417886.pdf
    • http://aedelsur.com/contenido/files/36895806635.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/96bhcs2u1qflrmugua6ob8g3ru/sapopatomon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=converter+pdf+to+jpg+mac+free
    • 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_off0000cbc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 16792 bytes
font_01_sfnt_off0000e3d6.bin
cb79f172dcb994bd72c822a3398c0acaf10958c5f0cd789657ad783937826dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 17944 bytes
font_02_sfnt_off000111b1.bin
e78ed3edc0b83650c8f5590d70a17e87d80605b193f662bdabe4f6f1d0d35a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 10884 bytes