Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff188b443830603…

MALICIOUS

PDF

81.0 KB Created: 2021-06-10 20:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce743e63fdc1071ec017bd92a7f1bab4 SHA-1: c37e5372560b6955c59c59c692fb19ba685eebd4 SHA-256: 0ff188b443830603416a52195216c8291bccb78de2b880a7b888a51247e08e39
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, that likely serve as a link farm to obscure the ultimate destination. One prominent URL, 'https://inwebjor.ru/uplcv?utm_term=lightroom+premium+apk+download+new+version', suggests a lure for downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=lightroom+premium+apk+download+new+version
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6e613071---silifexopurojef.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7ebf3065---60308981708.pdf
    • http://adabaskimerkezi.com/upload/file/48140344916.pdf
    • http://kapsalonvogue.nl/files/file/88132704559.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/18c028653c8c8984e7d44fca02400c7a/vojudefuxejewexozugiwo.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c188c4392---6227811991.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a9a14ce0166eb09bddfb7278babe498f/kaxunizewuxotigamidenawub.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db99cc112---raloxolafezoti.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/achkm15sna3u5k79gg1jhi5nb5/79524355746.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lpacepj2qgt9tuogpk1sbroob6/losadupagobawodopiw.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb720ab37---topufafokiwidediziv.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/n9u44c9okskcjcdp9ptmoosdlh/29705634118.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d1196be81---79801178150.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6e794a49---10046567266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed48.bin
303009994f99e0da05f0ae2bf8378a647b6aacd827a7382ba65494091ffd379e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 5412 bytes
font_01_sfnt_off0000ffa5.bin
daaf513b4b6fc36bff4b163417f9ef14e163412dd2b61c781a73ce0363e23042
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 12172 bytes
font_02_sfnt_off0001271c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 4324 bytes