Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b2f13b0ee537f5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 00:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5134e7066fa41db1bf1cf02b277d546 SHA-1: c8314ea84219a5ed82ba437bc2b12c8b1bc528f1 SHA-256: 85b2f13b0ee537f5daa3536ad5358a15554e3eccb4b59b91bf3838dd2919d430
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. These links are designed to redirect users to malicious content, exploiting the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thenext.pk/userfiles/files/limubafisemiwifexug.pdf In PDF document text
    • http://gamecoast.by/uploads/files/73489298336.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/pefozod.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xokaratojawuwexadixeva.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/89410057466.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf32167e2---38828658830.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4c6c216bbac980ed3b12a33a5ce5b8e8/japeruredawad.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/61564647712.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/musexovuzalemikikabeju.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/zafisak.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/81ao4voa6ajcf5m0b36p9frkv4/xulorimewem.pdfIn PDF document text
    • http://freeski.hu/freeski/file/59156474801.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rotaxawutivorafewipug.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/gowoxozel.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/20734421502.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/967909ccfc5fa6e7b647190eeb59561e/kupixudivi.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/98986876221.pdfIn PDF document text
    • http://normel.org/files/upload/file/winezupivakuwes.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210903033008.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e94a73d9a---faruwujavonugiguxas.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/149266917.pdfIn PDF document text
    • https://viceda.com/userfiles/file/wupowuxegedas.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/37377965947.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/80435467723.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/32388357378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+app+data+apkPDF 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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 9828 bytes
SHA-256: 695254e291cae2c3d73ed3370c509e2406b840098da665a355dde76374bcd543
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 17528 bytes
SHA-256: c0169a2034a9054cb5e9a29504dca97c2f18f684cd7dc813c78a9bf0becef789
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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