Malicious PDF — malware analysis report

Static analysis result for SHA-256 834bcb9e7c9757d0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 15:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77a4e139ba26e9f79237e73b2c4b4f8e SHA-1: d95286f72071c04ce0bf61c5792795868bec8955 SHA-256: 834bcb9e7c9757d099d5e93fa67c8e2d98d8ed7c45f7175a4b3801cfd3c84456
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress upload directories, suggesting an attempt to disguise malicious content. The primary purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=flow+the+psychology+of+optimal+experience+summary+pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161350929891d1---97494977559.pdf
    • https://goacetours.com/ckfinder/userfiles/files/dodokodekakijupu.pdf
    • http://slmj8.com/data/userfiles/files/39246744244.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f758e36502---nawitemezejovonalabi.pdf
    • http://bangdientunhk.com/upload/files/tikenarexiw.pdf
    • https://didacostruzioni.it/userfiles/file/62761927230.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/66498645908.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e09ea787---25266165482.pdf
    • http://marmaraisg.com/images_upload/files/pipiwafitesazevul.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141c36ac9693---mumufuzewag.pdf
    • https://mimpiindah2.com/contents/files/kekamojekomefavujuzokuj.pdf
    • https://asiquim.com/ckfinder/userfiles/files/wivubirigelulupebaxe.pdf
    • http://moristas.com/userfiles/files/75574632735.pdf
    • http://polishingmarblefloor.it/userfiles/files/43334246058.pdf
    • http://homeopathyhongkong.cn/files/63168101108.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140370a9a3d2---zodurezikeka.pdf
    • http://bioaec.com/userfiles/files/46788113978.pdf
    • https://transport-vehicules.fr/userfiles/file/31481160496.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140263613338---mubevasugujevimotuwu.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/lituwetum.pdf
    • http://sanga.asia/userData/board/file/kixewixabok.pdf
    • https://sssmri.com/ckfinder/userfiles/files/65219849997.pdf
    • https://amatnieks.com/pictures/image/3329147683.pdf
    • http://behtarinekhodetbash.com/files/files/63070864690.pdf
    • http://around-sicily.net/userfiles/file/45697647903.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_off0000c3e7.bin
34e916b70e2da8f5c211a3e101dc7c0b0de03518e8f070a354446bc497ef33e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E7 11444 bytes
font_01_sfnt_off0000dea7.bin
164ff390bb1859f0cc7aec6dadc011a0fb67b04c290948651241f2e7c226d729
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 18280 bytes
font_02_sfnt_off00010d33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 16792 bytes