Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ea574321cd8151…

MALICIOUS

PDF

74.4 KB Created: 2021-06-30 09:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a5e5a266cd9ae0389f3877fafea7c43 SHA-1: 891f2b160b190423e8352ec3899cd5319089e499 SHA-256: b7ea574321cd81515f9cd2d53b2a3ec558d1e1e1a7173724c95dd5bb28f0683a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=barbie+mariposa+and+her+butterfly+fairy+friends+full+movie
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e60aadd0---10815661456.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/68d78b1b679430cee37429cf7c3be0f2/49901474550.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210525180855.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7e658cce6ee40edd79d875a31b95cc0e/37917533420.pdf
    • http://pileshoppen.dk/userfiles/file/2117634895.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k7fjjm8sge5u95ljcoutgu092h/24067663843.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f077b489---gejivatoronimora.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb41049d60---xavager.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/7961185109.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/cf20cf8a897176e0ce8e23c630c97158/zevumoxowejasopuberi.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/70524024425de49cb0742bb182fc16d4/wijojodimogiwixulobefujeg.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/83750324696.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c783953f556---silapidenum.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cdabc8f85---najarifixodepotosu.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160786a1d12680---wujapiro.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b98492f91---kusesede.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dc2ece06---welapixija.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/597b2b50a1de3b460064bbfb9b3b4716/85806485707.pdf
    • http://wienbildarchiv.com/upload_files/files/14372917519.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/h5ohkv3c2sva0auem1g2rn0pll/xuxolejexek.pdf
    • http://hoctienganh123.net/upload/files/53628744767.pdf
    • http://solamsys.com/userData/board/file/40438592886.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3c939ebf---novusuzivaximuf.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_off0000bff1.bin
676873228add09e09327c1f306d5ce9c3654245f6159aa93d63154297b230472
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 16260 bytes
font_01_sfnt_off0000e9f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16792 bytes
font_02_sfnt_off00010210.bin
139becff5e905085c34f0dedfd9a1270f2bea608dc47485f48d4adf6db9a15c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 11236 bytes