Malicious PDF — malware analysis report

Static analysis result for SHA-256 88af6d5d0af0b4aa…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 23:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 245f69e7fa14bc9f401f3a537a1a0375 SHA-1: 7a0dd831a2c08d9e966bc2529be032a0e289b0c9 SHA-256: 88af6d5d0af0b4aa89b4d39797138209834972d522143b2d2f0414515e36d810
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://groupburuemas2.com/contents/files/78459692035.pdf In PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/67188609646.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/dasetavujibok.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/42104176111.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/81672570801.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/fomowowuzulozesinexox.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/23966029870.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/kiwimasogelani.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/malowibukaxejolukaxagi.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202192147288070.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d55778f36---97109444609.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/99356499539.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/furenazafivikameri.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/zakebigojajimir.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/moxiduvigowa.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e052c4cdbea17bdc4ba188477ad37733/10207054087.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/19754141683.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/kelafad.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/lijagevakevoxitarufis.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/77575a123818c505af95173d461af46d/98334917021.pdfIn PDF document text
    • https://dm288.com/slicice/file/mowufekejaxuxaken.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lalekilivokoxedugisiwagi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d8fa8180---komevafagusepoxes.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/muxil.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/52859942916.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/3115352500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+u+download+music+on+androidPDF link annotation
    • 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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 18676 bytes
SHA-256: 6284ccc3509b95bc5f7786d17b717b91f7e610c6ff7f4e5921d83c117def188f
font_01_sfnt_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 10476 bytes
SHA-256: aa2bb15084ce762986c8cce80146340e7a567d381cc2bb147287731af1f57e18