Malicious PDF — malware analysis report

Static analysis result for SHA-256 66190f67575483b2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 13:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a18e14c283a5f328c896033aae56ffc SHA-1: 3ac4ffc0da790d0ebedafa19ba76e6440ba2c8b6 SHA-256: 66190f67575483b2ac5176e0413eae56ba864f0032be960f1b27c0c7ffb33efa
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further indicates a lure to download malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=captain+marvel+dual+audio
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2ea2a203---pafugiga.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/86981476827.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/gipabatovof.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/52702609505.pdf
    • http://omgmediatank.com/userfiles/files/257553270.pdf
    • http://foodchemsino.com/d/files/paxize.pdf
    • http://sinching.com/uploadpic/files/202109021802525204.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9c6b507e19f5c064cc40af64baf18e03/34643791304.pdf
    • http://ambvet-trefontane.eu/userfiles/files/dakazodisatanituwagi.pdf
    • https://jotekonybakterium.hu/userfiles/files/26907938174.pdf
    • http://osteriadelcampanile.com/userfiles/files/30513127850.pdf
    • http://montazenabytkupraha.cz/files/file/77019016994.pdf
    • http://nataliashishkina.com/userfiles/file/visumuzigasepezisetevoxu.pdf
    • http://jurabos.nl/include/editor/file/33430491062.pdf
    • http://eastwoodfamily.net/userimages/luluwupeluwebuwoxisowil.pdf
    • http://targhevaticane.it/userfiles/files/87480649122.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c5a0c9dbb9ffd1a69e940c827951b7aa/kemaver.pdf
    • http://apothepharma.com/upload/files/39177486829.pdf
    • https://kurtoglumob.com/upload/file/38996858853.pdf
    • http://argyleliquidations.com/userfiles/files/92382937147.pdf
    • https://interior-mark.com/ckfinder/userfiles/files/pageguwija.pdf
    • http://tuvantindat.com/uploads/2021-09-17/images/files/79142493701.pdf
    • https://tenekedjieva.com/uploads/file/jowugaraxeminuzaxiza.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d70511539---38637295683.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/2317562653.pdf
    • http://teranor.com/ckfinder/userfiles/files/jukinim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae8.bin
98ccf232a583f429e76fbb8b56ca3b59bb6b1a1549c4dfef259d4aa71b3994a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 18572 bytes
font_01_sfnt_off0000fb8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 16792 bytes
font_02_sfnt_off000113a3.bin
c26fcfce7f10abbe74b552ab0722b3f94ea322f787bfeb5dae7d4e17243f3ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 10584 bytes