Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8613c8cc161d80e…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 04:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b70d6abae91edf0dfeae33a3f5279ba SHA-1: 3f7134b1e2d451edeefa4aa5361c9cea352d68d9 SHA-256: e8613c8cc161d80e5413ba4819d21101b606798ba9297115a4f6daa2444ab81a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to other PDF files hosted on compromised WordPress sites and disposable domains. This suggests a multi-stage attack designed to distribute further malware or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://frutapacargentina.com/ckfinder/userfiles/files/48922896987.pdf In PDF document text
    • http://frickcontrols.com/uploads/files/53687829797.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/kugavetusudijodokosezuju.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/95480569587.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210923_162223.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/sukikuwabewikolutixases.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/jofir.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/fewuvatuwaferu.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/toziku.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/56176804028.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/u797h867augimog75995lmbma3/penakofuki.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/43079428267.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tck6ucmhocg9vfen3v3ibhjb92/14890708025.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca4b1975c---pugivor.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/7034105320.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/lijoge.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/43236986683.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/gukogopitazonokinonem.pdfIn PDF document text
    • https://music-group-store.com/upload/files/18468095795.pdfIn PDF document text
    • http://vaynhe.com/upload/files/60244468496.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130260201e7e---subobe.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/bijabawasasamajikaz.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/xalapapagonubiw.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/33278351539.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/68356926075.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/49469607103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=faire+capture+ecran+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_off0000b5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AA 10372 bytes
SHA-256: 8ec5ca82dcb2091a281f9d56ce966137f7ee0cb02212dedc24c44417a93720c3
font_01_sfnt_off0000cd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 16840 bytes
SHA-256: 54db54462bc24e3e1c7b9c090569f6fb3f712e01fcfdf8cbe917a1ba592c2d00

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