Malicious PDF — malware analysis report

Static analysis result for SHA-256 301b34b7c77f46d5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 21:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86a44dea1e85ec045a88a0d0ce01e8bb SHA-1: dfbfa19cd45abf945f6e1fc1f76f0a49fafb99cc SHA-256: 301b34b7c77f46d517f6ef17160ee20eb2e88806716a67f1476506cdb653169b
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several heuristics indicate that these links are associated with compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=install+android+laptop PDF link annotation
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/1810875056.pdfIn PDF document text
    • https://dukupahit.com/contents/files/57584386056.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/napazobomomedoden.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/57c42641bb561b3f2bd7d0a0482116e9/4622082720.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/98164807055.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/ridinobowuta.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e05fa2a0f---sodav.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/78101032701.pdfIn PDF document text
    • http://erdbau-rauch.at/50318595198.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/bilujepezajopazupa.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/sufam.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210902042752_vgj48b.pdfIn PDF document text
    • https://advik.net/userfiles/file/xojumubeteman.pdfIn macro / runtime command snippet
    • https://kanat.com/upload/ckfinder/files/65446809716.pdfIn macro / runtime command snippet
    • http://luberoff.com/userfiles/file/benijezame.pdfIn PDF document text
    • https://agermag.ro/mm/file/tipiru.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d20b71169c99959621343631a957ce7e/jevedomutadulazi.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/zison.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/wedifigisopok.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8b4e6ea5a61148c5b06141e292e1abd9/1731226486.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/57512189540.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-1/20210901094649241508.pdfIn PDF document text
    • http://csc0512.com/userfiles/In macro / runtime command snippet
    • 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_off0000bcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF3 10204 bytes
SHA-256: 03a1f9332170ef39296692650b7debecdf2f0e7cce0fc25faeb6d1a1de1803cf
font_01_sfnt_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 17500 bytes
SHA-256: 1b87c2e0af8acca35788f06c0cf7bb6c5e0b1a4b27529eaa069afa1fb331cbce

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