Malicious PDF — malware analysis report

Static analysis result for SHA-256 820cd453b259079a…

MALICIOUS

PDF

88.2 KB Created: 2021-06-25 15:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da3718ef928dacee3f7c3b9b8aaa8e7c SHA-1: 287073b01808ffe0ae4fdb0534b2a1008eed3320 SHA-256: 820cd453b259079a7f223ce4baa578dbb5271249555e02819e6f57b92b4f8079
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and potentially track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=dungeons+and+dragons+lizardfolk
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/07decf6575b4bf7a4dd16e25e56e0044/96477487711.pdf
    • http://babamoleskine.com/files/file/vakugoxogovilef.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b30fd4943b9---xalojaz.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869398c486---lexodije.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab228bd2903---70054701468.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/86af5d7fd70da467fecd640099e8f7a0/bokojoxenazamakoxipu.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lm5d28i3if92lnp3r8i8u0gvmj/zuvoziwubal.pdf
    • http://gmicropilotes.com/uploads/files/fodapaxali.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f65730cf---wovoguxogiranewadezutomo.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca6d7f969---71154005930.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/siguwe.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/treob4jr5293rs0pftfb0cjpn2/76812838026.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/47459b0239dbb402e36611f0ca9d4df3/nurumewafo.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/4io9bodpd2vurp0j4fpa01t7mf/gudefemupexefafitavaku.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40daca1854---jusizaw.pdf
    • http://curry-box-deluxe.de/userfiles/file/gevugud.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_off0000f696.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 16792 bytes
font_01_sfnt_off00010ead.bin
b2d5f8568bb8e698d2a09d15d6fd3cb36149f8f66bfaf1754ef4adb07d398f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 10684 bytes
font_02_sfnt_off0001271a.bin
bafd1a7221294d2cbb32b4b2baae2f65befb6fed29fe7ed08638bfc25f774003		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 17176 bytes

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