Malicious PDF — malware analysis report

Static analysis result for SHA-256 442107ac60bf8161…

MALICIOUS

PDF

100.0 KB Created: 2021-07-15 22:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a7b61ef1f31a6150b3f7601112304251 SHA-1: 085b9af56d88de9642946ce0d11ebb7de003be41 SHA-256: 442107ac60bf81615bf283ab725906ada7efea9ac3665dd0301a7daedc61ad49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://crysiq.ru/uplcv?utm_term=how+to+hack+in+pubg+mobile+lite PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608903cdd68b7---66637897341.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gatifoxawawote.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/66569092892.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/66043555633.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210618_1E2C6641D79755EE.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/5105332483.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/tukapo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c380e4f5e0---zelanopar.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0c6690c4139b5ab421b9b55dc565fce6/76402564425.pdfIn PDF document text
    • https://estoniapools.com/contents//files/jozuraxob.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/75cc05b28019eb0f1aad8f812bdc9cb8/zedusagosedoj.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/60057996872.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609682547a6dc---bojulakexitetifusaga.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9f85a4b97050022aa2633a29265dd8e6/lesejolowerupidapor.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/58108446223.pdfIn PDF document text
    • https://aedwea.com/upload/foto/felara.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/20584161397.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/666ee2c3647ff87a58df7853a215790f/koxobanenawupe.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c493c78ed---sutufifavebopoloxadijin.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3081deba---foxepadojakaxekesikuta.pdfIn PDF document text
    • http://vucert.vn/uploads/files/noguvuwijuresozi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d4bdf1b87825dee7862f8794c01d1534/30956361608.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/butavijetenupigoxujelu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6696f3a2---fusugikuvuw.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bba4873bf9---92350965144.pdfIn PDF document text
    • https://yuss.it/file/torezasigu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 16464 bytes
SHA-256: 11b77af1bd633d36f34e9dd9be0813d3c1a6a3e67823dc45fc3eb3b9a5e6ff85
font_01_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 21612 bytes
SHA-256: 978b1a88280609b20e7bcab1802821194becf6d2e0cabaf3a80d85433efb7f32
font_02_sfnt_off00014f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F47 10960 bytes
SHA-256: 5497943c21cd4e099fc2a6f7d651049a09c5b9223e38efb07da009567a216f00
font_03_sfnt_off00016857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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