Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac3f9274b58731b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 17:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37dc68ae5b60d6119e826f9dc7358861 SHA-1: 10fb09fad670936d9144ce3df5892a01bb50922a SHA-256: fac3f9274b58731b68d6bd070f81ef2e3eae281c5fb3c28c3e524a6f78890879
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in some URLs indicate an attempt to manipulate search engine results or direct users to specific malicious content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=dragon+ball+z+shin+budokai+2+ppsspp+free+download+for+android PDF link annotation
    • http://reylab.com/userfiles/file/58456158139.pdfIn PDF document text
    • https://alpinashop.bg/files/kemozo.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/39496940954.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f6e665a76---29942350689.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/63928934955.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/87405423048.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/jumiwasivededevatibi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/rg6msec9lrju0jh8245cmaoko4/15811895339.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/ganizoroguxetunuwafugute.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/88223546997.pdfIn PDF document text
    • http://pileki.com/imgup/file/xitokefate.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/firebefajudazimasotufek.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/waxomosedebebaniwututazod.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/jusarubaxegomejabirunulag.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142595f8e61d---37380086192.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/31328207963.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/dubigakusutodidutiruwid.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/vejimadijilinafajajagaz.pdfIn PDF document text
    • https://resicolor.com/upload/files/25628370477.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/numuxisomakerexe.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/42619910348.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/127228669.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210919_191601.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 3056 bytes
SHA-256: abf828d98ae994d970835958bec7678b1283c105922726b18e0f668a4e99b811
font_01_sfnt_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 20228 bytes
SHA-256: a55d6edf459fcd533964b15f9532d1609df82df91fb3000912287564ac9fde9a
font_03_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 11280 bytes
SHA-256: 7819a9af25995bde2aa128a8efcccd01d7d4336aeac04e8a47abdec4ec733258

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