Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b36682e79bdb809…

MALICIOUS

PDF

96.4 KB Created: 2021-08-25 22:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50996cc8c1e610680877c28dd1e8a467 SHA-1: 947611eed2dfeb954ef52033c070dffe2be30876 SHA-256: 6b36682e79bdb80909ee0dd6c1b9a4fe21a60cbdc81ba87208749b3fc51b1513
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 CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://chcial.ru/uplcv?utm_term=english+class+7+chapter+1+question+answer PDF link annotation
    • http://minerva-collection.net/files/files/67611548465.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/85257318780.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/pawoki.pdfIn PDF document text
    • http://apsons.eu/files/file/77820537627.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/20040363637.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r94jesaabfrlbr36n0hn3ucmbh/14284224634.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/73346447571.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6mo2r2tp2pnp33sqie9ng03ob1/pezolugetikamuza.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/kuwixogekipobu.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/gegekojawesut.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1501790dda659b9edaf987f4de15ba50/bonazumesibunajudux.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80302b5f5---40158587922.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ec535626f---44992988756.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8951f6a322---wusixidogem.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qk5rli2nulvivqfn7fqm7imsdo/nakemotufijugotafupa.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/97534360632.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/680160e32012ca9817ce475021783d05/21040709993.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16279406750038.pdfIn PDF document text
    • http://friulanapanini.com/images/file/maliwewitumolikeditoragez.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea7f749259---zuviwovun.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/4262869396.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094519d8ad0d---19388504434.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b772d569b07---sigoxobegoxara.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 17280 bytes
SHA-256: a62e09c818590a4075c9ca39a9ef7a7611e8f49107941c06a0b6784ee3ab1b54
font_02_sfnt_off00014059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15870 11068 bytes
SHA-256: eca02527004d8033241cb43d211e3c9cd572f19cf53fa87b538b57e4d68e0776

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