Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bfbae5d622f546…

MALICIOUS

PDF

92.7 KB Created: 2021-08-08 15:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 017694e6526b4bb9e1ca6b67dad250c3 SHA-1: 73e0c9629143aa04161a872463f88b1cf2318bc5 SHA-256: 81bfbae5d622f546026ae72e39ed2269f0876fd173838860a5fec8a96ae97f5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://huntic.ru/uplcv?utm_term=my+chemical+romance+full+album+mp3+download
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbc045820---98569232022.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6463276f0f73ec86ef6cb628115a4003/sifewolo.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a70f429d4---77680496616.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/33797776091.pdf
    • http://bobmeetin.com/media/galleries/files/55684328286.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d21a92fb9---11328849041.pdf
    • http://bitite.lv/media/txt/122/file/45826870839.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/bunazalafelisubudupufe.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c946c0d082---72238216037.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/70074712796.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160703146e4f2b---27716155579.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/8972116850.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63d5d0da0---29196847293.pdf
    • http://botosani.ro/img/uploads/file/dilutuvakeraxaterefaxab.pdf
    • http://aven.su/userfiles/file/15224874194.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0b517725---29916307196.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ae038ab7f39---98653166077.pdf
    • https://kurtoglumob.com/upload/file/92265107957.pdf
    • http://adbuilder.at/ckfinder/userfiles/files/lezilanumogudizitak.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2551cd997---89890597326.pdf
    • https://widepolymers.com/userfiles/file/wufopomudelezekaretap.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b9616f0a60fca3e3f0348f8e1558c973/13731188778.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ae0666b5f53b343061a3534d06707a52/4600572683.pdf
    • https://torgradio.ru/new/files/file/78230402450.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775fa95dafd---zemekakubemofafidewu.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lth2b6vahrbaoq0o5rgbetp3ho/regixakukesono.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d111.bin
f1769af0444f59c0e900f56957ec5120fe19e289c8162e3df12c478fce08b0f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 11224 bytes
font_01_sfnt_off0000eaed.bin
8f230a235d6abfe7c2e603588538890cef47300d22b904f907dfefba060d1732
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 12936 bytes
font_02_sfnt_off000114dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
font_03_sfnt_off00012cee.bin
e0ef6e3f44868bed9cef95adf4e5514b4fce8b01e5cf01ff2900f77a25ad5481
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 25308 bytes