Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc785fee0fa79d4d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 04:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6718df9e2759f0dd96b8bb5e90384dc SHA-1: 3f56aea459b0a10d34ed793b9d4cce89e6cde38d SHA-256: bc785fee0fa79d4d686739a90cec8a050b9adad714a4ecaa58677959cf3af235
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of external URI heuristics and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=integers+class+6+ncert+pdf PDF link annotation
    • http://bellina.pl/userfiles/file/lepapiditubugezilerutawag.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/38449313319.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/warojobezegivozazararep.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/so67h6dg741kfda9h9dmktstl2/kovoxujuzekowazato.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6686998b3---33584535281.pdfIn PDF document text
    • http://king-tableware.com/uploads//files/202108031922586378.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pmpj0tubmju4f2mv7av5djee2p/zopuxerekipaselaf.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754c21c4e5f---mefidisozowezomadumevav.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/muzatasuluxunonujisizu.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/053fc4b7096b521bdffbaf82ce10688d/63661482777.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb330de7d16---nojagu.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/58811206044.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lututul.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/73672022353.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/8550279525.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/tiwumigabixogozugiw.pdfIn PDF document text
    • https://coluer.ir/documents/file/85156472227.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/s350287tuesv6unbq0l1flgol4/lijavuvemasojeg.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9597844df3cd45f2a673594056b32982/28093952338.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/87721890856.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/96737470329.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/pizegomeravuv.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_off0000bf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7B 10704 bytes
SHA-256: d7d783cbf62838304be827523fdee68ffa15c7366720ce1b3dea0ee5ca905505
font_01_sfnt_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 17160 bytes
SHA-256: 9f3e381783db7dbfc821edcce6756129493b31e55606bdb4c58adb4ffd52ef2a
font_02_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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