Malicious PDF — malware analysis report

Static analysis result for SHA-256 022ad42e3c3a22e8…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 03:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98f77ea07960da242dc40285ef070441 SHA-1: 121c2fd162de56bea771f322941e77f53691f7a2 SHA-256: 022ad42e3c3a22e83656598c558122403e6b4e1f963f1445609613300c2d0a6f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607333ccecbd1---wupusuwilanemutuz.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/8444807950.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098754d21654---sesawuretanode.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5msjm5d9sao32mu5jmrn5gr866/97804939561.pdf
    • http://parkhigh65.com/clients/4970/File/36631513436.pdf
    • http://taiwanglassgroup.cn/userfiles/file/zazagexutotoruz.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ae632e1b---kolofivigozuvusipoli.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/bizux.pdf
    • http://nutranghongngoc.com/media/ftp/file/26396862585.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf7de0c1c---53077146902.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a901e621ae---99713959760.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/nofawurafezivazamikiv.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608856db49b28---mopuraduzogig.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7308a0469---kezezo.pdf
    • https://sharadsangam.org/UserFilesTwo/file/81099710004.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160844327dcbfc---34586586762.pdf
    • http://wooshin.kr/uploaded/file/148455497960a35ab33476e.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/felepejesizuwinudo.pdf
    • http://safeabortionnepal.com/userfiles/file/754782214.pdf
    • https://motelandratecuci.ro/userfiles/file/53006992647.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c64fb69a28---pirizinili.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/44738226432.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+hottest+continent+on+earth
    • 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_off0000f0a5.bin
b3bf8cb149d1d3d495698cec6ade3f54cf1f9e2a95ecf17a02e2868936d56572
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 10244 bytes
font_01_sfnt_off000107a5.bin
471fb085f73bde4d35d516a9ea1e5735b69ab536881244bf09fc7882ea4a172b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 17220 bytes
font_02_sfnt_off000134dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134DC 16792 bytes