Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef671bcfdcd59180…

MALICIOUS

PDF

90.7 KB Created: 2021-06-30 04:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d35036ed28c121e7259dd4cbcd5ca9b SHA-1: c4de1f423b7a0ba6b65d417adc8bee3ab0a333e3 SHA-256: ef671bcfdcd59180680d5e44c722d349f09b680cf058859a92ef5133c35d20e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, with a specific URL identified as http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3e81ddf1---gejuwoxuxoxipuza.pdf. The document body is heavily obfuscated and appears to be non-readable content, suggesting the primary function is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3e81ddf1---gejuwoxuxoxipuza.pdf
    • https://footballsod.com/images/ck-uploads/files/kimanijaf.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3219203b5b1bd3b6a782e4b38693a3f0/nefelavugaret.pdf
    • http://agcslohian.com/userfiles/file/98434771416.pdf
    • http://tai-yang.tw/taiyang/upload/file/lamulawasazawugolufuxasi.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4d3352a14ebcdde8754fb5da46d1f4fe/13589092829.pdf
    • http://rent2day.ca/ci2/userfiles/files/wefenanomuborem.pdf
    • http://maxbrio.kr/files/files/59074667275.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8c121db1---xejofuju.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8d086856bc41233b2494e01c9d4dcf6d/mapoxo.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5dc02fe1---tanonunebalar.pdf
    • https://kisikana.hr/userfiles/file/8272638741.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb86be7051---golesezudetuwemo.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ddf565206eec1a697a78371f0d1f8951/33185358267.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8dd16c21594cabc5088baf7d7f2a8d4/75638695828.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad921e5dda7---mopuz.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/80303842496.pdf
    • https://hotellemaritime.com/hotel/upload/files/ludeponinesomobuzuge.pdf
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/65930376840.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66581f696---tanolo.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/40c80b2f9ca6f4b0cf171881c78a9756/24513773810.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160968c2f0d02a---93115733736.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/59570cc92be0db260e593abf1af28aaa/84386274995.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b8ea5f22ac5faed453c305aa9a855017/91742422852.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fqic86hp4mal56dvnn16scj3cm/79141872302.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=at+the+weekend+on+the+weekend
    • 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_off0001017c.bin
ecaf7f606c312656a5c6069aea6cee9d1a488f0a220cb7fc6840e65674a779f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 17760 bytes
font_01_sfnt_off00012f7c.bin
336cd83d8d5dfbd5eca057dc776a0655ace92f0a6656d150ceb1cac9565a0cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 9936 bytes
font_02_sfnt_off00014573.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 16792 bytes