Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6993f4d96f4d195…

MALICIOUS

PDF

88.5 KB Created: 2021-06-30 12:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a10b69890637402fc6f00cd2c0c8c1a5 SHA-1: 8db88db75225189d5f5d224159a04ce5ef00a231 SHA-256: b6993f4d96f4d1953d7a15b1f615c3c541a402fa6a2f025c9a0037c7b525fa8b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=wine+the+older+the+better+quotes
    • http://www.cerathai.com/image/upload/File/38551928871.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84312624b---tagitafeki.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982172bf726---pesaxowez.pdf
    • http://www.aportecnica.com/imagenes/editor/file/3561135437.pdf
    • https://penzionradvanice.cz/res/file/terozivedexekilifuwevu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd733a043---8635986233.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n2j9ef6ggun95h8e4df2da2sf4/18098066935.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d358fadc8c4---54176373694.pdf
    • https://allcreaturesinc.com/files/files/wabod.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/45f9627ea2fbdf3ed10faf4711f4ec9b/97941584151.pdf
    • http://moneymaker-gold.de/files/53608239988.pdf
    • http://okzawidow.pl/img/upload/files/51171459862.pdf
    • https://aawyx.com/sites/default/imageuser/file/nugezuwivejapubanenuxusiw.pdf
    • http://huile-de-nigelle.info/userfiles/file/vujerariximune.pdf
    • https://pacantioquia.org/aym_image/files/73522254908.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2f48ff35ef48f959069b75d136006684/5817039672.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/94435427312.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7e7f61eb9---43809417042.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0041e6af0---gixopizi.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/af54847dda32f2860b771bbc65c9283a/85758852965.pdf
    • http://alemotta.com/resources/original/file/sesumifufopu.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986758db067---mofejitezegemisumagugodef.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1954fe4c7a---70242406201.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/d80afp39eu7hkvletk0rmo43fa/repurafaxewegowafemanewoz.pdf
    • http://dailymaytrogiang.com/userfiles/files/84738750322.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_off0000f797.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 16792 bytes
font_01_sfnt_off00010fa9.bin
782bedf39798280e53c79f51c3e10bcfa7b6eee6a923b61eaa99763d579105e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 17768 bytes
font_02_sfnt_off00013d09.bin
3da6f3642069f99467c07d49884d35593132735183c6769c439f473fbaba4002
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D09 10564 bytes