Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f365b6230515c2…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 09:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32b5b88ce27e8afe7afd42ea64c6a48b SHA-1: 7ef13cc4a4e031eaaab684d1489968476d7d9394 SHA-256: 43f365b6230515c2136344f180d3e7b576d052b0749019ab34708bfc7841e400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/c52a051321378834963efa8d0936b906/50616089240.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2550258156401694e023b70741e83698/70106054051.pdfIn PDF document text
    • http://asustainable.com/global/file/zododexosazitifesoxujo.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/49587036965.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/86882624787.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/befevomuremafinusijisupuj.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/sadiwitavaxopofuwotuxesu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/67610499149.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097edccbebab---kafanegupu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d3f2992b0d0fcd117eee06f812f1ef09/35783380480.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/evjh497kn7nlchdggebfdbh5lb/32525542144.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/59065709187.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/towugazire.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/tepidewelixepobazewupidud.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/63569141335.pdfIn PDF document text
    • http://iphysiology.ru/upload/35689922591.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9495472b9---tonazunixan.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/41118784430.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff5540a9ce---rodesub.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f6ecc9ab7---mugakibusumaginotixifema.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tarurakozafeni.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d793a4ac9a2---62166271432.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/donolowakumeri.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a468a9684---xejadipa.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/27924348766.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/77897120603.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc8f861c1e8416de9f2c2112b50122b9/5132518762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=places+to+visit+in+achill+islandPDF 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_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 10432 bytes
SHA-256: b6bb50616dadcaec0c5497a4019a9ef5c4d56257bbfc9d9d882039bd528aeacf
font_01_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 16360 bytes
SHA-256: 2e8b27cc6f7f2e703af1a98aa47146488ddb615ca8d319e4956d05e82ca9d81a
font_02_sfnt_off000137f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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