Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d6b727a2fd261c…

MALICIOUS

PDF

93.8 KB Created: 2021-06-28 02:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e52c77b5d3f1ce20cabeab59ca43dd4 SHA-1: 2e6fb5a08cb01f8b62675e886bcf133cdb0586e8 SHA-256: 36d6b727a2fd261cc35956ea38dd3abd25e12da2a78302cc3811ef282657a725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://fotografoenricogiampieri.it/userfiles/files/walovufesutenelefejepez.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609548a17308a---96982367212.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15cc62929e0272e43b00264efe2ae1f3/vuzafoli.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071943833603---83165399036.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a3915023c3738a28579bef0923f2f19c/41435908169.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gnne2gcf3u2lcms4r3nlqou841/63302636597.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/o245tuoqskud47lasm516uve90/kogomixotukujovafanoziluw.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/di35tu51udc383qo0molc4a1p4/22011453897.pdf
    • http://flygarfield.net/userfiles/file/14427248124.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/zofedolebuxer.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/314ec8eb32488efd999d30f87611656d/34975905453.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ct8aqduc7ht0bsucqht7mi96rs/vurinezijivenego.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f9f2f34cfb1bf52ef69aa639ca89d9b1/dukejisidatadewimumos.pdf
    • http://nfc.soo.jp/file/38121982493.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nsncqi7hiugps7tvoti0874bh1/xefiloromegemitabenu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160781b77ad25f---filuz.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/18665847014.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b59cce9b---menude.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39a27e0f3---zigajulefawomaf.pdf
    • https://t2sc.me/userfiles/64657341161.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e7fa9d32---10213824031.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/43070a0e7b9ed05af4a23e369309d258/zegag.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c3c5abae---sakupaweditukinixekewegu.pdf
    • https://mygo.com/ckfinder/userfiles/files/42812601640.pdf
    • http://nelly-design.ru/upload/files/45335154510.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/616e1f0be5cb869fd00010babcf4b105/79469967962.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+grand+budapest+hotel+online
    • 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_off000109ba.bin
5c65c4a51c18b5d05ea03e51b4955e39368d8177cab566df07d04898c877cafb
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 17876 bytes
font_01_sfnt_off00013746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 16792 bytes
font_02_sfnt_off00014f5d.bin
7b497c1df96b93cf35a6d098b54b568df219592066e74ac5c22efd90a87db15f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5D 10876 bytes