Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b34e7661054aba…

MALICIOUS

PDF

83.4 KB Created: 2021-09-28 04:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4edfcb42a6620ccd1e391f5c0c55dba SHA-1: ed5246e941f644c9ccdaa9cfd9400a2c48aafd51 SHA-256: 96b34e7661054aba8e6814b3986675f517a69384c4c25232e5a7cb377d2d8198
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristic firings point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jocoseatee.com/userfiles/files/24520342127.pdf
    • https://ximangcampha.vn/upload/files/70362756097.pdf
    • http://hockjoohin.com/admin/uploads/file/duwodovojosefikemiroboraw.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/243bd5f241280061e9f26b3c023d14c4/pumalevosemufeforu.pdf
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/83341240784.pdf
    • http://dnepropress.net/files/file/12304248867.pdf
    • http://baozhaopharm.com/upload/files/51763407241.pdf
    • https://karlschool.org/uploads/files/202109040956498907.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/43707604853.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/68530963207.pdf
    • http://www.heatandgas.com/EditorImages/file/zugosarasiwikusomaguvese.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/11266082225.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/61825555599.pdf
    • http://www.jindatunnel.com/up_files/file/tozowavabejoxigu.pdf
    • http://velapower.com/glwh/UploadFile/file/2021090221101273499.pdf
    • http://maslatalaia.com/userfiles/file/55184516565.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/65347291359.pdf
    • https://eqonetech.com/upload/userfiles/files/73256632232.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/db554fa4ca6953a3a6c69d488172782c/lerosedetiwenezuxetinulis.pdf
    • http://back2wood.de/userfiles/file/xifixitilifag.pdf
    • http://simoncaulkin.com/images/mikosanesimu.pdf
    • http://speckrepeg.by/UserFiles/files/35515463893.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mhoq6ijvji9hcupa1qhfif4qpd/kekawekojidetirepomire.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/nepijix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dokkan+battle+mod+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c35d.bin
d59369af583189ee4c69d930763aaaf8fba8ae691e4299278be8e456cef7d9d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC35D 10368 bytes
font_01_sfnt_off0000dad8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16792 bytes
font_02_sfnt_off0000f2e9.bin
800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 16188 bytes
font_03_sfnt_off0001089b.bin
7bc81a243e5265522685ba84b6ac03a84ba2fd6697d164675b64c3bccba531be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 20892 bytes