Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cd8053cf8bfadc…

MALICIOUS

PDF

85.6 KB Created: 2021-07-03 02:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2857497b32f3bbc9941f811aadd5fb8 SHA-1: f68e9c555c9d4e55044dd4a80f2ad5104797e5bb SHA-256: 97cd8053cf8bfadc2fca057ed532f4c98887421a3a3b0d82131eecca666a82bb
156 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 identified as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=interior+and+exterior+car+wash+near+me
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d75a43325b---lujowimerovo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd19895ea0---tevogafaludeminer.pdf
    • https://burstallconrad.com/editor_files/file/84141315756.pdf
    • https://dpmceramiche.it/file/genedubikalezolakoravi.pdf
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/wimazuvuwuf.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/sefebotatatepapow.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7786a51a---lasawefoxoramodogaka.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/37cd077e852d0a776bf77639643dd455/86256087134.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a59fea0ab25---85507780430.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/23485879759.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3860f3c003483bacbffa7de927870185/24539401349.pdf
    • https://jiu-hang.com/upfiles/editor/files/77829961998.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35edec0c006bce6113819739a80801e2/velawurexi.pdf
    • https://mimpiindah2.com/contents//files/6095956962.pdf
    • http://brenno-tojestto.pl/userfiles/file/lenutiguwibezigesexagop.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2da5f8c4f5f3931702ade81624fd2bec/27652643413.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gg63i43molju4loq2lrv1ltmf1/rupitegufivoxibanorunep.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a20f79219f5ab5e90c777ae14ff55dde/xosasodeloditojedes.pdf
    • http://all-pass.com/folder/editor/file/12373736528.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609833338d4fc---27878670159.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_off0000eb14.bin
a36818cc1a762380bcaf5344921b30912ebaaaee589a3aac171e0a342a5a3862
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 10728 bytes
font_01_sfnt_off0001039a.bin
f0d385cc131046750abdc77ea6c485491a49888bf7f9701ed9487bbf50cfca05
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 16808 bytes
font_02_sfnt_off00012f5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes