Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51efc09cc688570…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 10:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fdf09819e4a02c176bd205803d881ab SHA-1: 707cb9fe0fe04a8e38694bf25ea1cc8dfb7139c8 SHA-256: f51efc09cc68857048a9b44db7636ca7ee02cfa3f88d62dd73c9b0879580ba46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicating it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content. The presence of embedded JavaScript (T1059.007) further supports the potential for client-side exploitation (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=joey+season+2+online+free
    • http://hanasushipickup.com/uploads/files/dixobezezewadusigi.pdf
    • http://www.sanjuktabanerjee.com/fckimages/file/68045440701.pdf
    • http://kurumakaitori-one.com/js/upload/files/waxizuga.pdf
    • http://club-integra.ru/userfiles/file/disotejedim.pdf
    • http://heryeryesil.com/resimlerfiles/zuxugamogariwuwuxosamuvu.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161324d0e3f87a---64986223087.pdf
    • http://crabandclaw.com/uploads/files/fojavepilumexuduwoj.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/616292652d00254d8ef6bd2de8087bd7/8655833648.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7df8cd83047176d2d79e7fffcced106e/larotilolizoziluvarom.pdf
    • http://fredericjean.net/oplusco/file/fovemeje.pdf
    • https://zlatartopalovic.rs/files/12781131128.pdf
    • https://hyundainhapkhau.vn/upload/files/fazulugeluparaxunasajukuj.pdf
    • https://ximangcampha.vn/upload/files/53660647916.pdf
    • http://scsytech.com/upload/files/fanatiligag.pdf
    • http://adriennemason.com/assets/files/varebugape.pdf
    • http://olapromos.com/ola/uploads/editorImagesfiles/70293405832.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/33849979014.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/sadesiruse.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210922164503156.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148c60837e8a---64761959558.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee3bd299d---lojir.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/515b41ad7f0ec3618fb967ae99f6f1d0/7122504178.pdf
    • https://mywayrtk.com/userfiles/file/38873634822.pdf
    • https://igruppe.no/ckfinder/userfiles/files/38004002443.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_off0000afbd.bin
026b15e25557eb27b21ff499ebf61ffaff25c9bcc953a4db521e5f28ee7efc4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBD 10336 bytes
font_01_sfnt_off0000c73f.bin
f56a266214636f9d6ec869755a3b9ac013dd140df5b2056533c2fa91dcd7977a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 14844 bytes
font_02_sfnt_off0000ecdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 16792 bytes