Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cfb038fb836dfa…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 19:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 275bca2562b2d241c3548f95df4678d4 SHA-1: 0ca2a0d9f95bc95e7161e5f00c948da488ec9432 SHA-256: 11cfb038fb836dfa6a297edd887c7e064aeff3842f665bc2d1553d4345e5ee49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised websites and disposable domains, likely intended to host and distribute further malicious payloads. The presence of external URIs and a 'download button' lure suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=99+names+of+allah+in+urdu+translation+pdf+free+download
    • http://kondicionery-fryazino.ru/upload_picture/file/84084868976.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/giwoxazatevewoveze.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088fdec79538---xuzela.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607729ee77910---satanozelolev.pdf
    • http://paillasse.hu/userfiles/file/558285878.pdf
    • http://jnejendomsdrift.dk/userfiles/file/5179596137.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5450635366---soladosofivuwubabibexu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e590bd6738c---vefobos.pdf
    • http://mclarenquartz.in/ci/userfiles/files/85485341118.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/50855520590.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/31518108049.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091967ec7c17---96767315106.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bb3a34bf7f051031ede9e0a3cdd274da/bazedikanaka.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cca5f2e41---21088465070.pdf
    • http://matsusushionline.com/uploads/files/60525887401.pdf
    • http://wojno-stal.pl/pliki/file/zofaluwajosor.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5cf80f009305dcf507b715b444539501/wokomixoribivop.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/72610ec0aaea4773bb22fcd721223c9c/4210296287.pdf
    • https://giaiphapthietke.vn/media/file/files/sogutafumunesa.pdf
    • http://vantaibactrungnam.vn/upload/files/61017204575.pdf
    • https://dafelia.com/files/favekezolupuweruwulevoka.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160845a81633db---37849284911.pdf
    • http://canadanur.com/resimler/files/77740853917.pdf
    • https://tsegypt.com/file/kogobixolazomi.pdf
    • http://gardenofsound.com/userfiles/files/24436114059.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_off0000e214.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 16792 bytes
font_01_sfnt_off0000fa2b.bin
eea6ade1f93a643ede2321dc5e39abdf0b7f5a6e6417037147ec0c110de63479
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 11020 bytes
font_02_sfnt_off0001139c.bin
1d9dbbd99db816c6c257eec9e9b555963b849603bffd575a04407dfca9f6c198
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 22440 bytes