Malicious PDF — malware analysis report

Static analysis result for SHA-256 faac3e6c4c744f4a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 11:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 634df85223b1eb2e182a5cf5c67dd130 SHA-1: d9ecdbe9a535a04c6f2c33d323b735e6830ad72b SHA-256: faac3e6c4c744f4a1ccbac50bb536ee7eff2a43c01e249cc5efe9a39f85b7b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its immediate purpose, but the overall structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://quaretti.it/userfiles/files/20070134157.pdf In PDF document text
    • http://lamachine.nl/userfiles/file/ligafejafalimivigunugizem.pdfIn PDF document text
    • http://dogable.de/userfiles/file/81902798738.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/xowajup.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/37999601906.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052830e580---67639517498.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xekuv.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06072e542---56960608475.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/giwokuriwogalijilesu.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/81790404828.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3cb52eaad---wenobivabalem.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0a0b83fc8---99015467605.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/daxutedakusodimibafab.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/10129612784.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/62458185619.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/72628099994.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f1bd6bae---foxawikawene.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/wumenonowezudavopuru.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/7935032716.pdfIn PDF document text
    • http://linker-apps.com/files/vopovexejemijosinemon.pdfIn PDF document text
    • https://seerupit.dk/assens/file/tebajesuxepumunosigiro.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b47a256fc7cdd37e5200064a286d9cba/rikemibekirin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ledger+book+template+pdfPDF 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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 10668 bytes
SHA-256: 6caa405af56f2b93ece1d7143f5755a4835af349b826f5049eb88a11ebeb5da5
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 17476 bytes
SHA-256: 3659f9feb919fe9ee0b35d8a258d8f9fed0657f0b9a9bb5605768172ff50a4d7

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