Malicious PDF — malware analysis report

Static analysis result for SHA-256 346f3ff3e7c20bda…

MALICIOUS

PDF

74.9 KB Created: 2021-06-25 21:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8323eaf1ce761ffbc5387ffd49ff2f4 SHA-1: 88c6b099571d79da9ceb50bc95399aa10e2240ad SHA-256: 346f3ff3e7c20bdaf4031afd975044b3534860fd2f1f23952b71518110a5796d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites likely host further malicious content or phishing pages, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bf221234b822273d0fce5423b1c24fc4/muxig.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/65768525954.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0647eade7---12386709624.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a463ec6a0fd---86295503148.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/sn0pa874vuhlv0c9kn3d3e70q4/66538182015.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/56d5246c89f066dbf2571d5b0ec2cb62/duluvudunoxatar.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091ecd36132e---16437973529.pdf
    • http://ibb-online.ru/f/file/55363326854.pdf
    • https://healthmatters.me/userfiles/file/60758870709.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c19d66316---lodidewuvatex.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/80d052e139c558b48e1d44060d877757/wafugusuja.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/1672053133.pdf
    • http://train-in-japan.com/images/blog//file/jutezunubimefeku.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b88e47713---7962846090.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f273b740cd---wojilelulujunoriwojefit.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34c455f09---33371444409.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hr9i4dkq3rj6a8mun3ii0rst54/dubelesepojodetikediz.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d49f7552e---xosobugogobanir.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e162251d26---legaxinoxagop.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/18813699384.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4a9f1693c---pebupewilezezu.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a3890a880269b6a6a68f2671e4874b04/19131579265.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ef2c460b---boladerajekeloboxa.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/leuvfhjaho2kv5ldrpi43v0v44/62141866069.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46cc0a4fa---xebewojag.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/53aef6a75521ae8831d9d26c7e6fab7c/bumutejos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+step+brothers+123
    • 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_off0000c2ed.bin
148049165a78d110d8440d1b773b04ec618f0e982b9698c3990ecd5c26c71443
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2ED 16312 bytes
font_01_sfnt_off0000ed69.bin
a4a69eed86fc8856be2d83486d6fa05410b1e97b1170c78043476a34b53eb0e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 10708 bytes
font_02_sfnt_off00010614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 16792 bytes