Malicious PDF — malware analysis report

Static analysis result for SHA-256 842c2a4fa7b7853a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 12:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01bf98b36bfe8eee3bff363a6b9a7942 SHA-1: 4b2802666c3596e3236bc90e69014b566ab1c4d8 SHA-256: 842c2a4fa7b7853a39d883476b58258ab545d5eb48fa617c41fa3a3f00c3c661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0ao0ho8jvqb6su02hf0hm8aths/5699783590.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/762939442.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160afad6ac5781---kirorexizufopemomeze.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///bisivugirog.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kijefokulikubaxe.pdfIn PDF document text
    • http://cycling-software.com/files/file/63096465324.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b5b96567b934d47935c611bf442b5ab4/40931764432.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/xuvejiniraw.pdfIn PDF document text
    • https://actor-conseil.com/files/file/8000126193.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/velogilosiz.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866957f36a7---1300190635.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7c61a244---zowosubobeda.pdfIn PDF document text
    • http://whatdwellswithin.com/file/jagataz.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/babalepegoxiwuratawaveg.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607093b0de280---83413518833.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tomubikexorapebaxi.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/05c3802b6081a9759a48e171c8458850/78928406614.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3aa0d70bcd28670292ae0a06c81b13e5/fexulazirimineruxap.pdfIn PDF document text
    • http://njxinbell.com/upload/files/puvurizaxu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/duzikifejubonogovibit.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/56195344069.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/49554940720.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/88892095947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=son+et+intonation+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 21108 bytes
SHA-256: 396dc8254b18a5c75acd221d9c1129ffbf513ac89740c45896867629037f3123
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 10252 bytes
SHA-256: 2d70d4002a983ffdfbd460bee272f407e04d1eb389133bd9908a9689049ac5e4

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