Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0043547021b6e7…

MALICIOUS

PDF

94.2 KB Created: 2021-09-02 06:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a9168d4bbd78d9c141db4bc83375cd3 SHA-1: 56045d8104e91bd2b75666ddca0377372dc6f60e SHA-256: 8c0043547021b6e748ae4318e7f99e6f6f1e541e297dedd41aea2a3c7c3a8fda
196 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links to disposable hosting and compromised CMS uploads suggests a link farm designed to obscure the ultimate destination or host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121768ea403f---bifenumijid.pdf
    • http://campbellelectronics.com/uploads/xixedale.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4htp253l5hc3akephaih0ato2k/tebagof.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783db570af8---podosalejoz.pdf
    • http://alfavit.tv/userfiles/file/44176288589.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b8521146f---wixovasuneduxe.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/i091u97204jmjsl0b6lohcv805/vilusilibatudatukur.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/4d3b6e6524ddf5cf8fef4cdc852d5c16/60893325529.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c7986ff3b21b4045ff42964b559cfc3d/24961178133.pdf
    • http://cuspsurgeons.com/userfiles/file/9841099484.pdf
    • http://hungbuloon.com/media/ftp/file/20849195409.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210624_396A3FE08984B7C7.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bd90376d9daa5a73b6080101d6803e21/fawemolokepize.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/43121590143.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/62910303438.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16103adc545e07---66915982192.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38c4f5a273---89699643867.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6e815eff---8894810268.pdf
    • http://tyextractor.com/d/files/zufelufopifetogaba.pdf
    • http://yuanyoujie.vip/userfiles/file/kejusenefafepexazoxe.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78eea5e12---60647375797.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/sotekuwupejufokar.pdf
    • http://dezmaster.com/userfiles/file/25768707867.pdf
    • http://jarosi.hu/files/file/vinekifoguneloziwoga.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2fe48978e229683a95d7f7d8f5044b8f/28267093402.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a75dd7eb341---33887609459.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=things+that+rhyme+with+gold
    • 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_off00010884.bin
0878bc394540dc4706340177278227bba5af7d5049fe6f5cf597c7cfadc9ad69
pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 18812 bytes
font_01_sfnt_off000139c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139C9 16792 bytes
font_02_sfnt_off000151e0.bin
2d1afb8db97d4b38c265b36fc0eabf4d9568f640b0ffbc16a83d65ac09e6bb09
pdf-font-stream PDF embedded font (sfnt) at offset 0x151E0 10860 bytes