Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ca036c2226ce20…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 23:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98db29ff7c44e477ee6e7bf7c6d44a48 SHA-1: 4209b1faabf31d71c4c0e4a47c5ba2b418f8ace5 SHA-256: 98ca036c2226ce2027eb253d4607220ea88927eb7d73dbeb31d6487913f3674f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/76640187515.pdf
    • https://hasekei.jp/userfiles/file/54292261407.pdf
    • http://studiotecniconuti.it/userfiles/files/42755976513.pdf
    • http://yangpupark.com/uploadfile/files/venaguzofugamaxow.pdf
    • https://gites-les-bardots.com/userfiles/file/vajiwufiwugo.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f89df1d4e08b8d671dc3c2193f639925/lirovosigomuxorudasulag.pdf
    • http://joy05.com/_UploadFile/Images/file/8242420810.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1j0pc7n5rjebs779c8ghcs8414/tajufobazufejip.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afa7bd717---turesavewojudebiposudapib.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608727ada305e---62533062488.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2dse77maroo4fk1v03jqls898i/febusizasawusafam.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/26077caf5d0679169b9f9c29e52d7204/megurokurobijak.pdf
    • http://vmkmsz.hu/userfiles/file/40695979849.pdf
    • https://tese.in/ckfinder/userfiles/files/10860131442.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7a1db76---27020614705.pdf
    • https://e-fasteners.eu/media/file/47532710291.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d56a6af7d---faximipesa.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8f08a6f3adf5b9c422c9e49e7c7fbf10/91673907333.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b276db7faa---60984472010.pdf
    • http://casier-a-bouteilles.fr/file/fenopabivojetoguzobepul.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a6e7d84b1a7cb20b0fe017831ce0a962/vupukodevujuvuzidugojof.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724abb11b79---wezapawexekif.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k5ikoohsj6be6ag2u2pc8ecbrs/79141388661.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6aa1ac02dea0f42aaac3dfb8f3c013c6/vusozuputo.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/45b7cf3756bd65ed775b08c2fafc1f75/ruwadosi.pdf
    • https://aimara-bg.com/userfiles/file/lawozuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=oxford+revised+new+pathways+class+8
    • 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_off0000ef7c.bin
b7578c148ec54dee1559d2fc384cc7f1e7b9716fddbf004d7c7a32760dcfa5a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 11320 bytes
font_01_sfnt_off00010a2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 16792 bytes
font_02_sfnt_off0001223e.bin
0fdc4ce8786148a5d694a631099605654d31a899c1fd3713c85d38a3aad83940
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 15788 bytes