Malicious PDF — malware analysis report

Static analysis result for SHA-256 c365595be5695ec3…

MALICIOUS

PDF

92.4 KB Created: 2021-09-06 13:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57d7f3ecf0b93ba3bd24f887d133198b SHA-1: c654f1b35a29e929006c2719231f6f4333d10890 SHA-256: c365595be5695ec3a4fb91d85b9be383a4aa79b2483633b560206508b0cd60bd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The document body is obfuscated and likely contains further malicious links or redirects, aiming to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730792d9b28---bepilatubikikiturazo.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f6ac2ae7---34182058696.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8163b12957994a5f18b2dc7fbca399fb/33119706999.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/51105767634.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/nobejitidozo.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/73110104432.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/39081577227.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bv4sksnn2ge1r49091gtsj8lou/92470975995.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c133398b0---tiwesanilubonasodazoxom.pdfIn PDF document text
    • http://unsersohn.com/images/file/zobenovawo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/69388075554.pdfIn PDF document text
    • http://e-hematologica.com/users//file/16118445275.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa63e70d56b---lebijot.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee54fa811f2---lekedezesimifidejeta.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae79878861a---puwim.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/37978193559.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/54278033639.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612992d8c2f83---33179431494.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c79039de6---kikitirinewopevikidup.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/24306644655.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/tugorexa.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/mesuwevokoxuwazi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108b99b44fb---tosugovibazegimogose.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/58146665815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=comida+chatarra+vs+comida+saludable+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_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 19696 bytes
SHA-256: 85646a6c2e1e67ba89994079ae8c1ece0e11e312302c4969f4ec2b6076a0a76e
font_01_sfnt_off00013233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13233 11120 bytes
SHA-256: 31d0b1f06a2e6036a45840dc0b18877deff7d48d2149ceb8ca55ad1e3bce11f3
font_02_sfnt_off00014bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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