Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a13e975e0676124…

MALICIOUS

PDF

94.0 KB Created: 2021-08-11 02:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1491d8184fff032e571bde449440789 SHA-1: c7db6ac68ae6fec70694ffa3eb8b8c417eef96ea SHA-256: 7a13e975e06761241b8b6db2f39d18c78cd4c0232b5ecbbf40389898064866aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malicious content distribution scheme. The presence of external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=kamus-%C4%B1+t%C3%BCrki+latin+harfleriyle+pdf PDF link annotation
    • http://hndgyl.com/v15/Upload/file/202161895468161.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e264037d8---89616883848.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ca5278d2---wixogewaputupetonufil.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/fivazifizararedijudamere.pdfIn PDF document text
    • http://cpils.com/userfiles/file/37299429998.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3c583b1c---bojavuzojanivumokudapav.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/faponamade.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/85e6eb8760e7cf4607c97fa11369a7a3/repufuvawutizupisodugo.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/xedipudobolarodemexawafi.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/wavabudatog.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e90e19247---38454795257.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/semimubabaroxen.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/jogotawifujijufozope.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/aa896b644de5145a3cd3702d2a57b672/pusamunirudeduvi.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/kuwuneridofezifi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d117e1d74---fejofanetevusex.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/salor.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/27359752509.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pn4a11tiv4jva6pkim6mb90jap/zikebomom.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/04ebfe48078e1f4d32fd33e2db7cf231/karitozazusewirepoxupafi.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/48067013710.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/zaduwoza.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021080615051273499.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_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 19748 bytes
SHA-256: 18edda0bad9519b8847e92dea9e31921bb64e3880b023562379e7ba17225a4b0
font_01_sfnt_off000135de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 11212 bytes
SHA-256: c92ce55367baefec228e9f652817842846d171e8574c618ed7fd79acae9f6836
font_02_sfnt_off00014f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1