Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b702bd8f3370d1a…

MALICIOUS

PDF

78.3 KB Created: 2021-06-23 03:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c41115a9c0200196557c158f43a928cf SHA-1: dd64d65f90494058f858cd034d281388428ae21e SHA-256: 0b702bd8f3370d1a4ddcf2f4e159f9828f4fc20f348f78e2e3104e3d0220448c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation tools, which is often used to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aire-limpio.com/img/editor/file/13697445613.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7cbr70cfkra7bcveins0r0jt87/88525726924.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da5f76e1a---sipokovexemufefidesop.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691cdaf5b8---jabekaliwazupufu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4b9db9ed---39534484284.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/97264500501.pdfIn PDF document text
    • https://landbar.com/upload/files/65371464088.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090d82358d2e---xofaxa.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0c7f1d30a03db737cd56d8c380f934e8/67741104156.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105290642413228.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/77a27e546da00c3ffbca7b028e68dc3c/99475239276.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19c411c8d8---13688850642.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/30ddc4a8acdef66a79347eeaa47024ee/98541545173.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d69e2eca---14123052403.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/81e22a0fbddaaa21febeb5a160878c18/legokadisatevajatatad.pdfIn PDF document text
    • http://kbchina.de/upload/55978784174.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fvbbdhq3t1d73k4999pjqc7i1m/90437163327.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca055cea57---panafenelewasigizelef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+editor+24PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 4700 bytes
SHA-256: 1ac83bc0d4540f525f2518cb56f2ed54f696c810a3e3279ae0365ac63354da38
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 11196 bytes
SHA-256: 4eabcb1ff0b84475af8f7c40396a898d83d8aa79c815666fce9411d3c1174541

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