Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bbe5b46294cc4d…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 09:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d9e0674ad1a96d9d93cdee83b8d2ffc SHA-1: e5652d97b30ee653af23f6bfcc81ac64f10ff969 SHA-256: f3bbe5b46294cc4d4bdd625a25cedaafb062a7ab21903b35fb80861c159f4621
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Numerous heuristics indicate the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=hack+minecraft+1.12', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=hack+minecraft+1.12
    • https://greenlandpark.com/uploads/files/15898456090.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/60619052551.pdf
    • http://efrex.cz/files/file/54477413685.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146f12ccac7d---99644649023.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/47427058909.pdf
    • http://9y.bfage.com/upload/files/20210911172902.pdf
    • http://kcwoman.medsoft.kr/pds/userfiles/files/zimajuf.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/84539296099.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/wixumulu.pdf
    • https://soalmatematik.com/userfiles/file/80831695680.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/5640660377.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8aa0bf46641971261b0fbbd5a8c892ea/73983509539.pdf
    • http://amphorabeautyclub.com/campannas/file/75944688313.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/80710731406.pdf
    • http://pushgroup.lv/userfiles/files/welovukuxazo.pdf
    • http://hnkingdee.cn/Files/file/20219820439.pdf
    • http://savalis.ru/userfiles/file/magosizewebobepoj.pdf
    • http://smart-ventures.ch/upload/Editor_Images/files/sagutunigavigawebi.pdf
    • http://dongtienlamnghiep.com/upload/file/kizemelasamaforajesip.pdf
    • http://dwornawodzie.pl/userfiles/file/givifasifasakepajitiw.pdf
    • https://efckrakow.pl/userfiles/file/57526081606.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e8603c1a994ffbbed2f2ccfbb3becca4/falugojekulekuxokavexu.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_off0000ae21.bin
75bdb3b4d6a382ea047405d7d2579901df8609e074f2231a36739db37be195cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE21 10484 bytes
font_01_sfnt_off0000c5fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 16792 bytes
font_02_sfnt_off0000de0d.bin
43ef10a8101fc3f1e9abd185427a68e01d9d6fe6e86e4fd10e80fab84a3a5e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 15948 bytes

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