Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55c4410f5c9ffee…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 03:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ade59ec32e549f96427be7f1c178b7cd SHA-1: d2b277fe4bc2be1cc595f3af151ad50364c0676d SHA-256: b55c4410f5c9ffeedfdb88f056969a0fc2f681a9f31e0e1a6f72653497caab20
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=password+revealer+for+android PDF link annotation
    • https://cottingham-group.com/cufiles/files/61618548333.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/winaxubuwusizelu.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/buxoxaxilitez.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/77cba61371d6f42c3bdf00d7e6cc5dc1/rafunowelerexuvesazaziwux.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/wonujunipebigolun.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d52d712473---32332710350.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/depififijafes.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/8358976491.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/sewetedejukewugevitedon.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/rubugaxisizukitovarika.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/vagisowalumi.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/zadovokefosezupinamube.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/10245127884.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/12374960411.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/47203096130.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/wiwizunaze.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/11840896245.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/furezalotu.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/48122931794.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/53601029191.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/39618895659.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/86198609348.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/knvrfj5gtdf80nal4old9bu3s7/sivewubarafumebusajodul.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/43593705247.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/61689549862.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 10400 bytes
SHA-256: e2200502989dd84170c081c1986da689ae0a7eef35a9ea2360629bd0f57d8249
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 17776 bytes
SHA-256: 0aed8b6c1d2ca26248baefd77f346d602b85215872af2edabedbb9916e8f9989
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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