Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16ca9758a40b609…

MALICIOUS

PDF

89.8 KB Created: 2021-09-21 10:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1d1f4542e647ed4df3a980fb3ffbb59 SHA-1: 8e8aa0a8df6799b228d2163fe07ddc8e3ceb6f6c SHA-256: d16ca9758a40b609714ebf4167a8fbabd9ae262bb3f7fafcfe96cb0350063dff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the phishing lure. No scripts were extracted, but the overall structure and URL patterns indicate a phishing campaign aiming to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=installing+system+update+no+command+samsung
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4e8d0b19---figebovowi.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493bcc0d6e8---70761002798.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149196dda6d2---wodopuf.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mhses1h54ks4kp6rdjjpos0nf6/24325930634.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161414d6de131a---jomopoli.pdf
    • https://mraos.com/web/userfiles/file/xisawikeniw.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/beniv.pdf
    • http://dioceseofniranam.org/userfiles/file/sadaxat.pdf
    • http://reguitti-engineering.it/userfiles/files/67450695878.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5d1b15df---lajujejejewotunub.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/42624314570.pdf
    • https://daaeportrett.no/upload/file/pusapomefopodavofigugi.pdf
    • http://villacappuccina.com/userfiles/files/85563348249.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/74594705435.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/94505572989.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984b953911---vusedukimukedalowaziwa.pdf
    • http://eaupureinternational.com/userfiles/file/35071090622.pdf
    • https://mimpishio2.net/contents/files/73776855270.pdf
    • http://matsusushionline.com/uploads/files/lugeruxevijejirobawisiva.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3749ff05---19983599196.pdf
    • http://thienthaopc.com/upload/FCK/file/63442942807.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/42926780465.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/45768836514.pdf
    • https://kohphanganhotelandtour.com/userfiles/file/vigabinad.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/imuua6r6eh2c7mieqpa6gtnq54/75139742027.pdf
    • http://www.lalorraineperdue.com/documents/39104013029.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f808.bin
aee878f2763a30cfd86a16700a458473a88c2cef0060c1f2ea0363f2ee995f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 18188 bytes
font_01_sfnt_off000127b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 16792 bytes
font_02_sfnt_off00013fcb.bin
fce751cac19762947f99c6f1733692e645b6558263fb44e677ec8b1c3792b013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCB 10924 bytes

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