Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42c91f68029fce4…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 01:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de514bb40b0af4d5c7a826d154d668fc SHA-1: 36a8e8853a8beec93bc6bfe78ea450c5a22d5bf0 SHA-256: b42c91f68029fce459d997991d3ad56c9a92c2864b236b58914f528be744dfe8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous URLs associated with compromised CMS uploads strongly indicates a malicious intent.

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 https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fklpu06t0tc5f8vtgojhp8te56/kezafebozixi.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077713520485---kidixed.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b204df7dc12---denakivijasijaramodejuma.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d79d870ac---vixegurudetewaj.pdf
    • http://www.toptehnik.si/images/ludetala.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090874ea91de---wibul.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6979e70ae03e3538156761484919aa2a/lunotofobumaz.pdf
    • http://astro2sphere.com/admin/images/file/23916134801.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3lhdnf4uspmr7nrdivlqs99ur0/nufetiwadufajosesinep.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/pnha9pppuvruddciej858nqgj5/13693700101.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baad95021e6---66692807267.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/pji1bs75glj26attf2krgd5o1v/6522582710.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gvtkqfftu9uug7d18jb1l4hop5/53031622787.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090077986baa---12695765037.pdf
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/37128156099.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a4a989719032b598931bb3094ccde2d6/segebulezatajemufo.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/juzejapobaju.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3pe9ehf8ad3u2uj8fj9ca06454/26144426657.pdf
    • http://club-integra.ru/userfiles/file/nezonuwanupetelad.pdf
    • https://bataretak.com/img/files/file/wagetebarifiponoterekotaf.pdf
    • https://bibliothequeanglaise.org/upload/files/wazivuxa.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607128b65664a---defamutozunitexexala.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=another+name+for+element
    • 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_off0000ea05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 16792 bytes
font_01_sfnt_off0001021c.bin
5b56ba1aff705ffec7097224e95005f7bf096d71f34602a8276552e7cc0cf269
pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 10200 bytes
font_02_sfnt_off000118c8.bin
caf59c59690050c672dc1877122b86df6ec89631355fd972e42226dcdbd91dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 17336 bytes