Malicious PDF — malware analysis report

Static analysis result for SHA-256 0100a9b5446b3022…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 15:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 935575b58c072e97862b8765d9a8d012 SHA-1: 78b41105c91a8cd906d20eceade2ddf1559765f6 SHA-256: 0100a9b5446b3022fdb14437c3fb02e784ec23336cf679f3809d40472dbf43b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://willajarmar.pl/userfiles/file/tizawo.pdf In PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/sivugusuxi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/30223547202.pdfIn PDF document text
    • http://showdoimovel.com/files/files/28078799658.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/81209535998.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/41259213543.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/karipugifebuv.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f47922639155dd0b6b937307d6bfaee4/34676309781.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zovojutuvibega.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/39902038161.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fbbc084581624cb32f59038d3a3c5cd3/94295215342.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af12582dd---filazaxolaguzigapudal.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/09bb100fc3e4d080a78528c6ff1fb613/63612896970.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/pavorisupaxi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/553e2df88c3230ec3342c5bd8174c6d6/firimufoli.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac096f25dfd---lewefozevezoxej.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/miduluzuloxagefepikif.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0f80d4c83d5b7456210778679062d720/30179753410.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/nikejus.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff1784e71---zukajoz.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/44478275779.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8eec917037fd60b610d87ce514e786f0/zofatokaxojiwes.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/wodapadulo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78882066728.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jomadunejukid.pdfIn PDF document text
    • https://matrixx.lu/images/fivobukesemudade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+power+of+the+elevation+of+consciousnessPDF 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_off0000c3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CE 16852 bytes
SHA-256: 4b1e58d0464cea21f560bfd02174195f3a4ccd6897f43e1bd632b88665ed095d
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 10792 bytes
SHA-256: d25c949d810291ccb3118a35d12cdf20d7837b020855565adfa0037654344d22
font_02_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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