Malicious PDF — malware analysis report

Static analysis result for SHA-256 f210c378b6e48259…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 08:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54e13f2113a13a411d6ddbea1e32d17c SHA-1: 1019f2903ffd3646d37e5473e4dba03b4b77c264 SHA-256: f210c378b6e4825983090e0599cf856967961ddfdbd3fcc1538f888d25bc90c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms on potentially compromised CMS uploads points to a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=fortigate+300e+user+manual PDF link annotation
    • https://sofanet.ro/ckfinder/userfiles/files/vumawotugoxuro.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b27265255---dudufugixak.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/25891204734.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/57003438290.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/xakupaliz.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/soveviwilifoperorurobemu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772a6f05f98---98039223735.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb78126fdc9---32602368279.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/86662739087.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/sglgaj8emp7fe4aoffdgbqq83f/99310924934.pdfIn PDF document text
    • https://xistenze.com/files/files/xovadonorasese.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/1173394860.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/59156760502.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc17bc85c---88497435082.pdfIn PDF document text
    • http://fxmeat.com/upload/file/c97180329b10577aaae98f0a6a448192.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wewamoluxos.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160afc221cae1a---jijojowujelokepobifosada.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ii637o5i6bmj4df5jne8ok3o24/mixozalukufaz.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80490289954.pdfIn PDF document text
    • http://grabnerestriche.at/37792522361.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/070a6jml3avr6rlifoqob11pue/kumofesatuf.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5a72203ac6fc95c3ea0ed5124e9d08b1/26358902885.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/33588301199.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zigavivexibipuzon.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_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_02_sfnt_off00012bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD4 10820 bytes
SHA-256: d0605ecea3c865368bceaa82edd9e3e23c882c644c2646aeebf0afbd14e803de

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