Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d9d3cec62687cd…

MALICIOUS

PDF

87.1 KB Created: 2021-08-19 02:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb07b0b04d9b323b97f20853a2e535c1 SHA-1: 108e6226de0767478b9247fbd688fdd1dc94dcd2 SHA-256: f9d9d3cec62687cde9ae7160a0ec51ef2b13dc53c690758f2b39a2dfd3eaf96e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/tcf2vlkdilln1t2m9ie3sjfo00/bugegodalasokogujap.pdf In PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/lorodipekimi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc1f16a06---rakaxamikilituwurimabiju.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zidopixedufugoferogi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0a9ae64890e8713955274c2837f27557/51392620739.pdfIn PDF document text
    • https://egf.tw/test2/images/file/21697539925.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6roe6gu05d7cs31fso9qlvt7p7/20382971574.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f8dcce965f43f8421331f7dbfa4e5638/tubajagamexerakife.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b9bc360fe3b8ec2439dfbd8d23c2055b/zudobup.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106909b2cdb3---xozujoluronetezenawofox.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/965011239.pdfIn PDF document text
    • http://355353.ru/userfiles/file/40263744525.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/giwefurolulujevel.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08bd30caf---rasajiduvogisala.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9517ea37aa7bfdf318b06fc0ddc033b3/mutalonixarilofagis.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kuxubuwa.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/75233625229.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/46676030206.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4cd961f5ff07cd68b3392143dfa0d658/36791427327.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/40273371091.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc18d20005---likatexomezoronozive.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/dadiribilotorubunev.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/20692332994.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22492aa284---27133117933.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/50302286123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=belajar+bahasa+korea+malaysia+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 17124 bytes
SHA-256: 352cdcacc85715278685917091bff15dc11b6ce81345a0afc44295ccbcf9cbf1
font_01_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 11088 bytes
SHA-256: 18f05fd284df75cc0635cd49b7fb2421a837482caff6e8db11ec1e6d3fde18be
font_02_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 18116 bytes
SHA-256: 4c127635b8f738b83fd15f83bcbf97ad4db7d421ebcad06dddf54ef616987e8c
font_04_sfnt_off00013618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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