Malicious PDF — malware analysis report

Static analysis result for SHA-256 8049ede8145c4cf9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 03:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a0c497a37544d073ed75c61ef2f80cf SHA-1: c5e28404ec9a779caad0de7980063339e915cee8 SHA-256: 8049ede8145c4cf97a3de17f5fdd1d58507f739afd4998af1b3ca0a8578cc203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=rejestrator+rozm%C3%B3w+na+androida
    • https://shreenathtechnologies.com/userfiles/file/87499173428.pdf
    • https://eltonltd.ru/sites/default/files/uploads/roraneroziputopawuti.pdf
    • http://janaturismointegrato.com/uploads/file/55048316289.pdf
    • http://beijingteye.com/upload/files/bexujoretizifufefejinod.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fffa02cd1---93407981757.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c281f78eab12c632bc5bec75fe13adc5/67169972892.pdf
    • http://agisinfo.ru/uploads/content/files/66941350380.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/dogerupedujebume.pdf
    • http://abwrosedale.com/uploads/files/rexomekagikotetuzuxepuzof.pdf
    • https://avflash.nl/upload/files/vomerakatidozotomowobivi.pdf
    • http://scuolascifondocortinadolomiti.it/userfiles/files/1843610829.pdf
    • http://zzzwchem.com/upload/files/fexifaxusiz.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdda099dad---90931787918.pdf
    • http://simonide.org/userfiles/file/zevazeputifelujoxatifi.pdf
    • http://tootingtaxi.com/survey/userfiles/files/vilupudawi.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fewagajezevevidikokuzake.pdf
    • https://laetitiabernard.fr/images/file/xiterobodupajodasilim.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/25285475405.pdf
    • https://capitalsyndic.com/userfiles/file/93729028385.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/53044126365.pdf
    • http://risorsaterra.it/userfiles/files/71038080208.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/76045512593.pdf
    • https://rmp-familienanzeigen.de/cms/files/jipapagivemanew.pdf
    • https://grnca.org/img/files/files/34326549889.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/gerifawixewazukiwajitoloz.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_off0000da21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16792 bytes
font_01_sfnt_off0000f233.bin
50591cf4a45e9015b8756ecbf9e6fd82572cce5ae3a3b9fd1eef49b3bb51260c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17604 bytes
font_02_sfnt_off00011ee2.bin
73eb45fa9d7a8c6bf1eee685e6b5efd524efe9b7e8a51ab267a4bf5c955e8163
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 10820 bytes