Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b69ee37c4ba754…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 18:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a573a39831fece07dffab5c6ceb587a5 SHA-1: cc9cb28ef0b225bf8f3ab5aaa1be082479f21250 SHA-256: 11b69ee37c4ba7544a5ed3eb05b088fbc4b6899584528fee4379648669ae8214
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters suggests an attempt at tracking or SEO manipulation for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=free+epub+reader+for+android+tablet
    • http://szkolka-wiercioch.pl/files/file/jiwuribajiruzeg.pdf
    • http://pozitron-s.ru/userfiles/file/fuwafuliguvevagi.pdf
    • http://havefuntogether.com/image/upload/File/8597884299.pdf
    • http://gamjagolla.com/uploads/files/pifulowi.pdf
    • http://aescantabria.es/upload/fckeditor/file///pixawopol.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/of7s5l8gbe945j9kkuvpmln8o9/59878488655.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd81fd7c92---36166844.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/13597324827.pdf
    • http://fedime.org/imagenes/ninotadu.pdf
    • https://telenovella-bg.com/files/xuboganifijajafoxoriju.pdf
    • http://lysfyyy.com/upload/files/xosojukajapubibaj.pdf
    • http://dija.lv/public/userfiles/file/limutowoxiberopixutorud.pdf
    • https://marathonblainville.com/userfiles/files/54883949765.pdf
    • https://skl.deindrukdemo.nl/upload/files/43864600133.pdf
    • http://maslatalaia.com/userfiles/file/3721150925.pdf
    • https://t2sc.me/userfiles/pekaganotiwixufega.pdf
    • https://pushtypathshala.com/demo/aims/files/images/files/82208823748.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cdb5789d2---figatufafaposesipug.pdf
    • http://umrllc.com/userfiles/files/56720828374.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16133b07b5cd46---gatigulisurelutow.pdf
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/zadijasidewotugal.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_off0000f094.bin
0233666377eac07876b1df0a1b11df49bd771d9fe58dc1674c33f39f0a14a10a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 10540 bytes
font_01_sfnt_off00010861.bin
0e48dd43c3fe2f32543d7cf3503ddf2d859b29bda7f9fd1f2017ace274ad9263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 18128 bytes
font_02_sfnt_off00013732.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13732 16792 bytes

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