Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c0476563022dd3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 21:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 052159dac3a97dab4e0ef91176a3db9f SHA-1: ef3c0ba8bdf937a6eb97a56a08fa8bb060f13ad2 SHA-256: f9c0476563022dd383be7721f8e8610a2de0d2114674a8d41c67a3ace9d5021c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The PDF structure and embedded content are consistent with a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://chcial.ru/uplcv?utm_term=livro+principios+de+telecomunica%C3%A7%C3%B5es+pdf PDF link annotation
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9b1785ffb84aebc1564bd2a1fc258299/pejudasokodiwiwukepesiwa.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bfd6be30---85793074236.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/bezogupilujimuvipeg.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f23985e82d79d4826787737489f7a15e/86371276644.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/jufafumexididosixi.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/74396157629.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/27449490df5b4389a9ac340b9db211ab/lakogineraziba.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/73002399554.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1611b633a256e2---90049639724.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/sapafidipobapekup.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3d155f7f---52599892648.pdfIn PDF document text
    • http://atrsara.ir/resource/files/37097955480.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab649daa838---rasuvoze.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/xakekewe.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/lt90evocrftako9brt5qh65brj/89491339012.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/24576744437.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/1064847501.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/57696812559.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/wufubido.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/mitapuduboxulim.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/79548073268.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3pnarma6e8gck0iuin1c05j9uo/52231782334.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 19184 bytes
SHA-256: efe0a110b2c99aaf5f50b5858d5cb17e8384bdc1c940c623f991bd55560c7294
font_02_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 11324 bytes
SHA-256: 0001f6336deddedd4cda79508d40975ec6b5b065491f7f0a7dc2e6652dfeb41b

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