Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b95fa84ed0a3777…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 05:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27fdfd99d5abf1dcc76e5fd68f4689d3 SHA-1: de0574773b2c9e2018ae771c62a104b9a87147c8 SHA-256: 1b95fa84ed0a3777786b251b7e2f19fdf04a2db5809a92f5cec15346688e75a6
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bumper+man+apk+download PDF link annotation
    • http://misr-consult.com/userfiles/file/30753717688.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161340c2f1c309---93986653790.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/38319954544.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/606a1878524ec11395bc60f91cdd9349/gumegujotutinunowij.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d027661105---17890054175.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/dunobixusonujalolixaniga.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/50684631195.pdfIn PDF document text
    • http://erimti.com/userfiles/file/48884673274.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/gezesujobegekiwotuf.pdfIn PDF document text
    • https://coil.hk/upload/files/46273707515.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/15282915738.pdfIn PDF document text
    • https://fivetc.net/uploads/files/65109976770.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nulobij.pdfIn PDF document text
    • http://veitali.com/upload/files/judalobatiwaru.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/26184815810.pdfIn PDF document text
    • https://thietbigas.net/media/files/mozomidexoxexurina.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/30276254791.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/50100525296.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/29249789660.pdfIn PDF document text
    • http://osayit.com/images/file/50980655304.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_C03A924813F93A81.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/64231189489.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4d32699f7b3cff7c43d6c67986960489/30034762197.pdfIn PDF document text
    • http://mobilenmr.com/files/files/vajomar.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/39476534189.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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 17664 bytes
SHA-256: 7e38c16e5964949a5cffe46ae5d2eb83d17438983dae540d5b83184f191d560d
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 10524 bytes
SHA-256: 59b8e18a23d0299ded136b9a7f8917e3c6efb8e4cb2fc3f729a084a4ce17d820
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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