Malicious PDF — malware analysis report

Static analysis result for SHA-256 63af1e9b734b35a0…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 10:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2b29756b8c1aa5a5c7c53d13383c040 SHA-1: 2619d2457339a7ae60bc018ff654976576ece929 SHA-256: 63af1e9b734b35a01f46ea18bc147aae1e1d63970eeaeadb8937eab882138c3d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many external URIs pointing to potentially compromised websites. The ML classifier and ClamAV also strongly indicated maliciousness. The document body was unreadable, but the presence of numerous links to disposable hosting and compromised CMS uploads suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b738d31466c---76877407294.pdf
    • http://championshipsportsrings.com/clients/23492/File/kosabezekitinekexe.pdf
    • http://globeksa.com/ckfinder/userfiles/files/20808785276.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/aimlldi8n6cbn4mcpkvgpilbp5/rarupixe.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775a42bc2d8---revosoraxabadikugekuwami.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/tenilamoribanerag.pdf
    • http://polimak.pl/userfiles/file/75128014231.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/oul0ahnbl174ckp7q2ab62l49g/20996544203.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608841f37038a---52696635340.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9dbe5f03ee5ba7af8abdc15a31c3d0a0/datibovepopem.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/wiluvabarigatetujilosa.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09d53d7d7---zibejotik.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb144afd0---81104180866.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8f4d67a8259ee813432a51601c5219da/masefudikaforofozupebugi.pdf
    • http://architects-desk.com/uploadsfile/84643442032.pdf
    • http://matstravel.ru/userfiles/file/67359035189.pdf
    • http://asijskepotraviny.cz/files/file/9965371849.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086e420552ff---42431001464.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bcc66610---radir.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080b2882977e---11260595312.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/05cd07a03ecc0623fd71af28bd93a064/85238050288.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ef3dc425.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/563576f45e5cf7758422b8edc87c78a1/zukuxugul.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/97840180391.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/add2c21fd24e247ce67432f3fea86663/nutefegaxelorolup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=our+king+is+born+this+day+in+bethlehem+lyrics
    • 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_off0000cd99.bin
e3a96ceeb24106e6146b16a55a7b01cd48f34650a91c014d6160717def5d9e57
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 11288 bytes
font_01_sfnt_off0000e7c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 16792 bytes
font_02_sfnt_off0000ffd7.bin
b314d88a24d64fefb08b182d364942be92892e78d06f34d50db1a218024a356b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 16556 bytes