Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d23f25cb32a6328…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 00:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9878ca15cbd6f9cef882fb8ccc3128c8 SHA-1: fbcaa1d40586b11bb62b5da2a02c48b467f4c590 SHA-256: 1d23f25cb32a6328f257b1d5491b00fa1ddca773345586a56ce4c4c48a7f9a4f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to lure users to malicious content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=industrial+communication+technology+pdf
    • https://mhreng.com/userfiles/file/26475133751.pdf
    • http://metapolar.hu/tmp/pumelovapusizofagek.pdf
    • http://kapsalonindex.nl/images/uploads/wutumuporawevorojum.pdf
    • http://flirdining.com/uploads/files/xatotutigadusezenivi.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e94b87c---99976207363.pdf
    • https://ivanda-commerce.hr/userfiles/file/wipobinidunegugeben.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7us7huqar72pcmqke3nal5bme5/48930765279.pdf
    • http://adance0112.com/upfile/editor/file/5854044490.pdf
    • https://advance-pack.com/editor_upload/file/jirodavona.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c5d9c72a4caa498de23d98b0f1f25185/34383194197.pdf
    • http://monticellotownship.org/userfiles/file/rofodarebi.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d37ea58cf5---79602973281.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad215945f---33771645550.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2762c93875---24938574238.pdf
    • http://kemnhapkhau.com/upload/files/94549443488.pdf
    • https://sasalidayanisma.org/uploads/file/towimewikibefo.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/vgj9cjspr7kiegi5p4tniklb58/kogunusilipamixazetari.pdf
    • http://riskhedgetech.com/uploaded/file/905172485609b214b057eb.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/32407258133.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e914a190eb5404197fa20b12a6422e7e/fomukisulanovebovabij.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfed87d55---xinivuponukikog.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/8a107835a1a5f7025b44b3a9bbd688af/jusuwiwoxoruvazax.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_off0000d112.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 16792 bytes
font_01_sfnt_off0000e929.bin
623de3879e206adee75e96592c4b6ac41f9c35c0219bee810583d6313f2feb35
pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 11232 bytes
font_02_sfnt_off0001031b.bin
77d4c88e511f08f7f4adcc983fddf62160d43f7155d2a51139d71016875c2b10
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 17588 bytes