Malicious PDF — malware analysis report

Static analysis result for SHA-256 160cd773dbd20b9e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 19:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 788839581aecafe32e1de2588f27aaad SHA-1: a366cdae35700ae5b56ba6419b2a7b72eafb0cf0 SHA-256: 160cd773dbd20b9e25b84d0b86dcab86b904c53646cd6a32f2a127ea46ff9d66
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://altera.ukrstroyka.com/content/xuploadimages/file/6989681856.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eece24ca3b---kexapusijopigusafivazil.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/56313329111.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/rufubibifepevip.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a5c14643626567353a6d909853443122/vozaxofe.pdfIn PDF document text
    • http://rs-entp.com/upload/file/gilujilarudoji.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/jojivapu.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905110333370729.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59270793770.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210904_234508.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/84128382934.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/bozat.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/watifafepigagi.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pipodirepu.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/92401831051.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/30ad90d4a60dc018631aaae19d2a1f43/vizimojumadefezojaza.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/zigefojinewovenodefamu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3406635---tezosanotegud.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/80254698291.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/litibesojaru.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/37914424285.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/545504789.pdfIn PDF document text
    • http://tano-cable.com/d/files/latukururuditabiduzusidux.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/losizewosipakat.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/vobolewewotikivelofobu.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/64268232715.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/61401310935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=movie4k+streaming+moviesPDF 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_off0000b339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 14096 bytes
SHA-256: 51449df220d30235c42c3ded2eb046f84d0c520ed223008d60a8e64e5f3c12e7
font_02_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10636 bytes
SHA-256: a317e4d3222df10f56141273865528e5b2fd82c26336a56c48122779c2882b1a

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