Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f12ce714da8f8ed…

MALICIOUS

PDF

165.4 KB Created: 2021-08-07 00:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67c51ff822ef941b11f77286b78e0e70 SHA-1: bf77ffb1e0f4875bf648ae2b6290b3dd9829619f SHA-256: 8f12ce714da8f8ed1d53a8705135a0bd35502513fbc4efcdc560983900b324c8
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to manipulate search engine results for broader reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/c7e6dcp6hsdsbtb0jelcmo0v9h/gogemulusowofir.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/47bd0512d9bfe52069912d4aafd2fc9e/jaguzuvixerudixaxipop.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/3582456430.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/57378288765.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/90874246883.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/gupojuvagetuwavamabig.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fdace0c19---95061110556.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50478b9a0---jaxetejedumalekilutoxatuj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb989af10---20106968278.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/1248309670.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecd855286---65722534764.pdfIn PDF document text
    • http://cosyromania.com/media/file/5037994927.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fefifeponodik.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/47047884584.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86e0ea5a4---perisel.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tlfgbks7osr9onoe5bv1ucehnb/9055532107.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/79517786146.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4cca230b---26415012185.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc948794d5---71189480073.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cf6722ab7---sanovoloraxabakumunige.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/remabamevugobaz.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/jarejidijoxedu.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/fivexaxenabebinapunoxalo.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/tatimugugivodidaberaxemo.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/60546827719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=preeti+arora+python+class+11+pdf+download+freePDF 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_off000222c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222C3 19016 bytes
SHA-256: a79e5224f20651af5b4e2c837c245c62d0a3fca5b9620176ba8473a3c2fd34d6
font_01_sfnt_off000255b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DC7 10972 bytes
SHA-256: 34bae2c213f993540a6cddf26aedec89f6b0da74fe98cfd8ccad307ae0dfcd0c