Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fb791c1c9b0d4a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 21:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c595bb433df60ad053ba597fcf6fbe9f SHA-1: 33633f6460c65651c7f8e3c67b2f7870de6a0ff5 SHA-256: 08fb791c1c9b0d4a5a899a5554e782a9a695639704e2d72ce7b80f2328f13bb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also features a large number of external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=countries+and+nationalities+reading+comprehension+pdf PDF link annotation
    • https://sklepbonus.pl/userfiles/file/34608619645.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/goletujerezepewa.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/forabemurikupoxo.pdfIn PDF document text
    • http://sungder.com/upload/pagefofuju.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/lerijidugiwabip.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/12706862746.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/s7npuht5ajl02cpnklduhdggcs/mopisuk.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/winajileguwakuj.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/gaganujojeritixilizezona.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/gaderafebutusage.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/tumerotesetosewev.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/xasevaxafejukifobem.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613355dd2cbda---71250201282.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/60247994664.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a558d7f3---20852928686.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/laginosedunagotaw.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/wifexiwelaxufuvadejoroxek.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/86825308322.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wapilisipowizakebibo.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/bofezizetara.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/61495654356.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210905_7849F8CE8FDE3D66.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/sezegoveguv.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/42441266974.pdfIn PDF document text
    • 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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 16792 bytes
SHA-256: e3cbe29faa28da72fe87bf5895528c6a34e1f03669eb9856982ae3b5ed0de3dc
font_01_sfnt_off000117c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 11200 bytes
SHA-256: 68e1793ed4b7df93a12fee2583c5c54b5a5431dd51df42030d9e1a4204630fe4
font_02_sfnt_off00013195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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