Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d992caa286b8916…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 08:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5dcb3f28200efccb6687572c6e9ef4c SHA-1: 3938cceb465741320ca8595f3e76ad9adace3340 SHA-256: 1d992caa286b89168b9c7c040f8665a7c9b2e38305a63b7378ca35931a77bb65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=sinais+vitais+do+recem+nascido+pdf PDF link annotation
    • http://petgears.com/app/webroot/files/file/94292333111.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/71751665046.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/20310654362.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4a38dbe3e---nukimeminili.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160977239b3a9d---83236469562.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cc88e96d313---gelujasiw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/35dc5dac80033f5057c6a333137164f6/33027316405.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/18462787584.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/76293241953.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/warumixuladedu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873570937b---45327108757.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882cc1a8a5b---86806271015.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/48330675945.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/24459369795.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/709329638cbe2460ec0cb9fca510135a/49427484930.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/74267189629.pdfIn PDF document text
    • https://atrax.hr/files/vovuzop.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf523ce627---87267711030.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c9da16a2---4427340738.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a9c1045e8---78052148287.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e637322a---86809803074.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210726_090929.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/paperugizusavozobexuf.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d827912c2d---43630809698.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/jatemijirepoguz.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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 20304 bytes
SHA-256: 69aac4340b20dbe16eb9863caa876d4e0b1ebd220d530cc7d21037ab30d674d9
font_02_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 10876 bytes
SHA-256: 85f3dd2236243dce4899873488c02866947caf97243cdcb9266be00ef81ba6b3

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