Malicious PDF — malware analysis report

Static analysis result for SHA-256 121963e384fd5f6e…

MALICIOUS

PDF

90.9 KB Created: 2021-07-04 23:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ede32521f2f07b112f1d341e838060dc SHA-1: ca39092ae5ffb23fee88ad5474edf594a8d73b8b SHA-256: 121963e384fd5f6ea123cc11dfd1c773a199e25ddce0d9ab2b54cac875d6d2ac
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of 'utm_term' parameters in some URLs suggests a phishing lure related to online applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://karpatskiles.ru/store/file/8521927905.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85df2b5453---95458299867.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd8c88c62---pedaze.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1nb7g1bjca8ja8idvap0arrhk4/faximomixoxiga.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d3de56f65b25984558f832ff86dd291f/midulataboz.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0aedfd0746e5241a4e3a142077ab12fb/nojojodikodutigezakew.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ce105ee316133e267251cb0b3b5f4563/50282692530.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d645454d13f---72033230077.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/xagigufurifil.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3o58kmav88k71bbl8iu7ig93ah/55005452508.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9cdac821---19461490467.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8fec56fe1e667c2c39ce99a795784e0b/sefabikesez.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa501fc1e---50835584921.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d23a8426---jozujakurulesumewisubal.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac961ea78cf---motubawiloxob.pdf
    • http://ruresept.ru/files/file/latuwasumebuvomipokerup.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/jcv8skj7im9ddbmtlgnpq7ba57/75039192245.pdf
    • http://nct-vn.com/userfiles/file/4071600782.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b50fddb2c5a---xozuxuzovasimuzopesa.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36342746d0---89198875912.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f5462c84beee5cc8ee5e8f9f14415524/figagekupuzadi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=russell+college+online+application+2021
    • http://perfecturology.cafe24.com/upload/editor/imagefile/37142071675.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_off0000fffa.bin
9e383ec59b2c4e21836263a9184a63a6e4d8a13ac350864176a0a9d77b0ff930		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 10888 bytes
font_01_sfnt_off00011962.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 16792 bytes
font_02_sfnt_off00013174.bin
db58f4f5b7c62a61942667c3b372d139b4db53a9eba08bc1c55ec6ea00d5428d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 17080 bytes

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