Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19c88dd9221b218…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 23:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2940feb11880f0bba2f437894d1b04b SHA-1: a7431145dffe7d7092f2f82b777d5ac2a9666261 SHA-256: c19c88dd9221b218814676d9eebd35e41db94feb8e4d69cb7a82d6758d69826a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lapalettedesarts.fr/gestion/file/81685707186.pdf
    • https://acronimocostanzo.com/userfiles/file/75143430928.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2c8e45f22723f6b4d15206086d5598b2/11463784413.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f9d187715ce263c871cc41a18225e3a4/bebonazukodaganilepafet.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/29319466591.pdf
    • https://publicbridge.pl/userfiles/file/57974312242.pdf
    • https://majorsagilekvaros.hu/uploads/file/mibomojapezuvizad.pdf
    • http://gayaarchi.com/userfiles/file/20210609123246.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/79d38275c1a03b2ba5db3114c981b6dd/7964649000.pdf
    • http://imreelectric.sk/uploads/file/16153614677.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92c845cd0---9125912686.pdf
    • https://arhometutor.com/userfiles/file/62071952334.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eui9smaeq5ji56a02490vkked4/29250947825.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/85998374451.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4edd1609---42540721911.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf39f3ab7---todibusesifusawiwulukof.pdf
    • http://eia-edu.com/userfiles/file/95490784378.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/bcdbc94c7613585ef8c8497659c55c33/20783860727.pdf
    • http://silesiacapital.eu/data/file/41499872127.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad91172b1---35328378652.pdf
    • https://aravlicraft.com/cmsCart//upload/file/32661775219.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fisujabitilene.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61bb36423e---gajumer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=central+idea+of+the+poem+on+the+grasshopper+and+cricket
    • 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_off0000f135.bin
c7b65405b600270e0ae7cb4578bd7e0d25c44c1927eb76d9311ae06552fedf29
pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 17672 bytes
font_01_sfnt_off00011ee9.bin
14ca9143075c628d6c3913ecd9ce0eaf6fc42c3c5755d3e08ec2930a89298ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 11192 bytes
font_02_sfnt_off000138b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 16792 bytes