Malicious PDF — malware analysis report

Static analysis result for SHA-256 181091494e6463d7…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 21:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6b62f7b373722abb1b0d8b7a4aef727 SHA-1: 3c23a43029198dfc2092372bbd4d372ba20bd2e6 SHA-256: 181091494e6463d7b94ca2afadc12987b6b15d12092bbe617e970714c8477dad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various websites. Several of these URLs point to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=hacked+apk+sites PDF link annotation
    • https://webmenuplus.com/images/file/jugonevimotelaf.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/boxufovozavimave.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161349e2cc10c9---nexinolozafutatin.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/zorotuvurukejokivubejelu.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/lorekulam.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/79686935898.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/11278128680.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/81248347942.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/tomixebazilofijikidimuke.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631004935.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/35720639286.pdfIn PDF document text
    • http://chromavials.com/d/files/59284760868.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/33259130586.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/90178290478.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/63406977870.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210903_E7F737761AB625DA.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b57ea846bb---90496333156.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2cb4146bf---6881160447.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/49660153291.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/31353643033.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/zarowilusoxovuzuxofuwi.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/tezarinope.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7b469cf09652f222b0e203a0ed9d20d2/rorutiputazosovidofawaja.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210902141158.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/bawaga.pdfIn PDF document text
    • https://aneri12.cz/res/file/5684295080.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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 10220 bytes
SHA-256: ff66d25f752907740608daa3c885b801e83151ba8796e50f36886547c9f1ede9
font_02_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 17260 bytes
SHA-256: f7e124953d05cf65c752aec28cca9abba2b63e804408c5bf5b5604cb7c09a2c0

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