Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c00b590e935b821…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 20:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b888296589ec3ab3fbf41b6137cfad2 SHA-1: 5a50a454c0d41cdd0ed0b7058ea08e69b89c2e34 SHA-256: 2c00b590e935b8210fbc7897fd051ebc231c32e5450ca528c4ccd594bc96cf43
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of external URIs and link farms on disposable hosting suggests a tactic to obscure the ultimate destination or host malicious content. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=2nd+line+of+defense+immune+system PDF link annotation
    • http://sro52.ru/uploads/files/vonodus.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf712e4e16---zofirifuworeseg.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b518c9cbd99---27153016197.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609326058650f---powulewukusudu.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/13401060987.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/10708560178.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/rafenep.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b91ea315e2d633ab07fd652c5c68c709/vubufoniz.pdfIn PDF document text
    • http://citra.cl/userfiles/file/pugoke.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4d7c450a---jazedog.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/22045850380.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ca60acb37bc1e4eacb383668db978cb1/80879632642.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kovegirulavopaxetam.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/sasekizoratulaferaragir.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/56497116078.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a4f9ecb3---xiwumeko.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/sulajasinib.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/808f997d71a4bb306ebc23b4930d5650/11998465366.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160790409d2f9b---dazusiledabelulipapoz.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/panelexesepifu.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/bazopojut.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/koxabere.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 16608 bytes
SHA-256: a463bf4bb5721bc884aca11f4b228d4dbf695fcae28ccc39a3e6b2985b48ad20
font_02_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 10488 bytes
SHA-256: 921ab16823ac8a1d6d60670636836b9202db16244db6642c2655fd043d26704b

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