Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fa0af0daf2505e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 02:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06abab15b4faad0ffb58c8b3edf20ef8 SHA-1: f56a1fbce87a219345f906845d135153f70dd28e SHA-256: 81fa0af0daf2505effb55910f06edc30493392eb914b8bbacb224337091bf62c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=gbc+emulator+roms PDF link annotation
    • http://www.trisad.kz/ckfinder/userfiles/files/99213700012.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/sobuzugotipefamuroxof.pdfIn PDF document text
    • http://halaljones.com/uploads/files/soweda.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/56973820615.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b372603ca4---64923862154.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6ebf21e2---36983059917.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ae054ca0---25391527575.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/resusirupiginekodunixin.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/27738553837.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/mezibazumafejevevefus.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/79560568505.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/6044095374.pdfIn PDF document text
    • https://ratoempat.com/contents/files/46214305904.pdfIn PDF document text
    • http://inercial.es/uploads/files/10761231122.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/93343352811.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/gimijeb.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f125d8d39---33000360961.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/66191883161.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f4cce8e8---japusotam.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210911013845.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/82821049960.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/mudewosuratepasikedesaru.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/2613321455.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/16293368646.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/76e902f9621f5d7199b905ab1cc7a8a5/kiwiwijezitekitelasix.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/kufosikovu.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/sabavu.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_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 18048 bytes
SHA-256: 64e96352df6efefe42ebf56e4e70389616991cb149b16d8a69e38e2a6b183ff1
font_01_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 10476 bytes
SHA-256: 0201e34d85b6072c2e63ef9dc351cd43cc8c7aed5ce4449c2fc7daee044c83c6
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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