Malicious PDF — malware analysis report

Static analysis result for SHA-256 3714a559ca58f064…

MALICIOUS

PDF

92.3 KB Created: 2021-08-02 02:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b954f32f12fd95d24746940f9af09bd5 SHA-1: 786b10b61bf830c518722f61adeb9f5de881b175 SHA-256: 3714a559ca58f064475862fabfb320a1ecc53abd6bfff3c5eb311325965b5cc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pistant.ru/uplcv?utm_term=aritmetica+de+baldor+ejercicio+33
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6a361b4a---tajor.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074f86fcfa6e---kapexilexutejofawosexa.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/8918918323.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/xiwarezosalijidode.pdf
    • https://agronlogistics.com/userfiles/files/likatonefopanobafizixugo.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5980962df---31603816789.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160886067d5c0c---75444914664.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/xajafufakabosari.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaccd062448---vunodagejibotutejolesom.pdf
    • http://coumert.com/images/file/jukigoda.pdf
    • http://smclassof57.org/clients/34860/File/71057797657.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e2547bb85ff3e7f9d49d9eb445babb8d/soxamatet.pdf
    • https://faresaldabbous.com/uploads/files/nafelimi.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8a7641e0a7eb0ce26276c94fcb51b415/wefazetefado.pdf
    • http://partnercable.hu/files/xopexop.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf9e35a66---vuruxifuvapitemovo.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/l5pvuiqs9uvpplpbshmbuufba2/turilasededimozasaxu.pdf
    • http://sarljarry.fr/userfiles/file/25333446050.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebbaa28685---rusaretivajamikot.pdf
    • https://ms01bet.com/contents//files/59714021447.pdf
    • http://prociweb.hu/sites/files/file/6229828208.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa2cfeabdd---27743427209.pdf
    • http://pincailight.com/zk/UploadFile/file/2021060315485273499.pdf
    • http://acecaalcoy.com/userfiles/file/remakimexokeropuvusu.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_off0000fbfe.bin
13320db668087039f491ff2ebca7fd1412ed1666c6c67d544d00b47a03b97a67
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10684 bytes
font_01_sfnt_off0001147e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 16792 bytes
font_02_sfnt_off00012c90.bin
4c4943442be541b4d4034109d5a28fa64b6f770ad4c6e342c052fb26dc7b13a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 19956 bytes