Malicious PDF — malware analysis report

Static analysis result for SHA-256 6810c7f43e9d0d13…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 14:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a921aac327f746675bec03d3698f4ddd SHA-1: 1b53f7aad282668cbe50e23f8123cd29dcab4e35 SHA-256: 6810c7f43e9d0d13e93990e9f2fe92f5db96eb00b4702041eb60a13e0a20ae6d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure and URL patterns are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://www.ximangsongthao.com/app/webroot/uploads/files/fogubikabinidelok.pdf
    • http://auxerretv.com/content/public/file/vusufifapita.pdf
    • https://thepainter.asia/upload/files/remajowalodekixamok.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dce233bdee---basivitunigutu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161193a7f9fdea---48105052355.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9gjlne1gt4adg0gnec44i7o3o3/40628819934.pdf
    • https://kurishupally.org/userfiles/file/zimulutar.pdf
    • http://alwaysfavorentertainment.com/clients/879371/File/33137130055.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d777d8fe---dajogakukujowedivoxovis.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b7757c16---dowovat.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613051ae323fc---77205927719.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210701_1D5B5604AEBA3064.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/34047250562.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/80882058977.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/17e2498a5af590b264b4b7b1247844b4/81325430675.pdf
    • https://eravukappalpalli.com/userfiles/file/6552686330.pdf
    • http://nickels.design/ckfinder/userfiles/files/806650432.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96eedc1bc595e104e4fa5503cef1a316/narilolixor.pdf
    • https://dacinsara.ro/fckfiles/file/79925027986.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/d7gqhn15p4g3vgu813lc5per7s/32630250741.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075003097574---zobusijoruwiv.pdf
    • http://eapver.com/upload/ckimg/files/202108181653542031.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/zesufovenufomibijazituki.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/003cfa028d9c1a4a521a6453d5ea1af0/28788853850.pdf
    • http://1qjd.com/upload/files/2021-07-23-12-41-57-pRM1MHzQ.pdf
    • http://dailythang.com/userfiles/files/68728070967.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=joerns+hoyer+lift+manual
    • 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_off0000bdbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 16792 bytes
font_01_sfnt_off0000d5d6.bin
7cc69a8bdec146cf9e2fbf1abf8d38de1ed17dfd63cbc8227b36a5e402692f73
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 10684 bytes
font_02_sfnt_off0000ee2d.bin
c760ed1a0969fc8fb21a1bb9bd6d6237f1208ba95f731c9413ae782248ed3979
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 17292 bytes