Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b0a9c3e8b3e43c…

MALICIOUS

PDF

103.8 KB Created: 2021-07-05 18:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c72d1b1a1eb6619e54c17d3b626beff SHA-1: ea32b8708acc45edd92c3c0cc3a6363f24a9e723 SHA-256: 97b0a9c3e8b3e43cade6dff02821b102eaeff4549c10b64b00aa3f4311cafdb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, with many URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://saopauloairporttransfers.com/ckfinder/userfiles/files/wiriwo.pdf In PDF document text
    • http://nhhs78.org/clients/63854/File/voxitubajetewusafebejuzo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/gapafuvenulomukef.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/jenilubaro.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f013b111---ramugozezuwiniw.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/niriwifubitugogavejunis.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/xigunidaxipizatetar.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/fezeletifemosijiv.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd457cbbd---62058161498.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b800238328575ef570806904741881bd/14810307596.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nejumanifatet.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210609052804.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1f044f39ac0f29102729e0c97545d555/30894489003.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1e4f38d0f4c8b4c5fe119a07702e7743/73967216141.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/86008710456.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/88296c668e1dbc1db3cb397db05fbab3/lomiruterobuxamimunas.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7b8a41f5eac456183ea84d0c72a93acc/fidejikemamizevowamojuk.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1269250bac---xopigi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160767e71e3939---47115389940.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e91c00ed9dcc38e61b3f5e0e00d3b5d/nidutemipilixe.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/42891183870.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210705_16CE99FF69BF19F6.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607463060db52---5834648529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=star+wars+knight+of+the+old+republic+walkthroughPDF 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_off00012ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 17672 bytes
SHA-256: 55db27dbe78e24a19a0d4e12d176641ecbae65684054bef23c058b1b3c059979
font_01_sfnt_off00015ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA8 11392 bytes
SHA-256: bb82325842eea8b0bb5ab418cae1f5edc49d84ba9d1528b328589bac3098ff8a
font_02_sfnt_off00017911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1