Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36a22c336568547…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 13:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55ecaa8836a9f3d10c3beb7e02af3c93 SHA-1: f1ce396c6f177c2eac14957f477519bcb471c4bf SHA-256: b36a22c3365685472268f1c7f55c559fb2f4d227e76785c5476de3f90a4cecd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://synerhu.ru/uplcv?utm_term=watch+the+lord+of+the+rings+the+return+of+the+king+online+free
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cefd55448b2d6c17bcd038fddcd56a6/dosoruw.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/90223790232.pdf
    • http://myconnect-thailand.com/image/upload/File/37151763588.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613114196c022---88779523618.pdf
    • http://hotelgiottotorino.com/userfiles/files/tugizidiguliwuba.pdf
    • http://pc75.net/upfiles/file/1630526345.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/30719130803.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/94997397319.pdf
    • http://bora.su/ckfinder/userfiles/files/pixevobefivajifuwe.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tusaxarizivijasosawejug.pdf
    • http://ski-experience-japan.com/images/blog/file/takufaweniwebakez.pdf
    • https://hometutorsdelhi.com/userfiles/files/22645245629.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/18e4bb3462cb2860a62034765e58f9ea/fudusedogapum.pdf
    • http://md-servicios.com/userfiles/file/3967151599.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/78980f3209222984b99ea185c29ca62f/906233836.pdf
    • http://canadianrockies.ca/files/file/75893368879.pdf
    • http://jatechkj.pl/upload/fck/file/ximosokavominujir.pdf
    • https://luatsubienhoa.com/upload/ck/files/galibijadanip.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/akk82c79r046niiraa82p62ad6/mozenasotapefagi.pdf
    • http://marymo.ru/uploads/files/66436476142.pdf
    • http://hoteldanang.com/uploads/images/files/35082318125.pdf
    • http://bsinteriordesigner.com/userfiles/files/vinajitimepinapegonez.pdf
    • http://inciboya.com/resimler/site/files/63070663531.pdf
    • http://cdkkck.com/uploadfile/file/20210907125613.pdf
    • http://hycxchina.com/filespath/files/20210910113140.pdf
    • https://godahoian.com/app/webroot/upload/files/23497187750.pdf
    • http://nenorm.com/files/files/xisinat.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bunimuf.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_off0000e59c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16792 bytes
font_01_sfnt_off0000fdae.bin
6e48cf778b042959e3ef9677ca8f4b30bf2eacf7ef080541cb6e653791c06237
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 18056 bytes
font_02_sfnt_off00012ccc.bin
e1a0461b4fc45cf86c6a73b9d8c43fa0b1c2927b7f00641e8c78b3023e6464ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 10940 bytes