Malicious PDF — malware analysis report

Static analysis result for SHA-256 850860cf91fef0cf…

MALICIOUS

PDF

72.2 KB Created: 2021-10-04 06:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92d1b48afff194e59728d5e48ef3a8fb SHA-1: 1e0c48463563290f2b6c09ab8db12187bdf1ee84 SHA-256: 850860cf91fef0cf50a500f08a66c4e11e2f661c1f1442a69a61965b79a594c1
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'cmd.com/data/files/45863626421.pdf' suggests an attempt to execute commands or exploit a vulnerability, likely related to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=how+to+fill+in+a+manual+tachograph PDF link annotation
    • http://thebrownbag.vn/upload/files/tidatod.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/jelej.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/13933246750.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/gifozuzixatukogukiwi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/b59sg7mtgl0psl5841idbj70rd/62553748732.pdfIn PDF document text
    • http://qdcmd.com/data/files/45863626421.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/33033079079.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16149aad5d35be---4434956921.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/jaxejubajivixaxipe.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109030717536026.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/78977259575.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/29612156514.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/20221909453.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/wetewaxabitowudowat.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/rowuw.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ec6c95ba98503a3d01f04cbb9632cdc2/xidazefozemuj.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/wiwujemokatetefatedurasat.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d771aec5c9af85fc6bb8b3db77744d45/fobokaguzim.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/jogegejomozikup.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/sozidamisivagizubim.pdfIn PDF document text
    • https://limsurempat.com/contents/files/48644817361.pdfIn PDF document text
    • http://boldogelet.hu/media/wolanezirogo.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/nibizamepekiga.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/damejogebuvu.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/livojeda.pdfIn PDF document text
    • http://thietkewebsite.btcIn 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_off0000b6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 10804 bytes
SHA-256: c394de32560723a974bc01680e0d1dcc34118c33932617ba8915d8d5243de044
font_02_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 16816 bytes
SHA-256: 32bb1461d6bb5feba16dec8de5059cf9fcc1b992b3002b779fc52615ca36fe66

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