Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad489c331fb236b…

MALICIOUS

PDF

137.6 KB Created: 2021-06-28 12:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a7377c0efe49a915ca8771e493dd3ed7 SHA-1: 8ef3c5c93d4cc9829f0faef46cb2351d6a31d7e3 SHA-256: cad489c331fb236b053c0adb20f3d2e4ccf0bba725bee2df124c279223d1c0c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8638

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://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59f5f3955---54416797211.pdf In PDF document text
    • http://sllight.ru/design/img/upload/file/timixigejota.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0oqmds7bs3eg743cur2q0m9hs5/60425927844.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9g0rfv79fm1lc1257c8rd3cca8/kunurot.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c675ab9758b---nopogajodorijo.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/84179996518.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/19462795336.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/43516065912.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/78886072842.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e8c31b2cd00655b0f97bec08fbbc11de/75167724576.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/puvekepi.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/55827177757.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec5d6bdb5---89195028951.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b13e6752e---gatonunuvomasubazez.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/63722417053.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d582035c6---dupozisunagidi.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/pekukesujuvojumijilo.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/vojux.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160849d1ea6f97---86993117725.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/naridimorumixuxolobu.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/80961477643.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916fa09a7bb---47970356477.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/majusoxakef.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/85835988291.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075451d82e4c---butasulefobiwu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5edae07d2---938904759.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e4baead23---57376220845.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1920f7a4147215f3915e33b59bea2b1d/giwokurisebuponagifibelap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=g+star+meaning+slangPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001922b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1922B 18552 bytes
SHA-256: dcceee0015a54878f12fc47c976c9acffc924e3db63c00b92634c85e51080678
font_00_sfnt_off000184b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184B1 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off0001b098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B098 10368 bytes
SHA-256: 33d886c75bc777776dccde5b1074ab18be5b2340278be0f6691070c907c48b03
font_03_sfnt_off0001c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E01A 22624 bytes
SHA-256: 92529bae63155bf54195d010900ea1d6f452d18ce81eab1db5d07fd138623e7c

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