Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0ffdecbe7e4406…

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 20:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b37fd5923f26c3ecaa9be8c17f0df3b7 SHA-1: a9913aa797bf5bb93dc72169f9160bd731f8db28 SHA-256: 9d0ffdecbe7e4406132834630b77c682664d289567adbafefeecce473ad5e58b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures to phishing pages or malware download sites, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6705e5821ca2be830b15870f8c41ed70/tamet.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rn4r5c8kh0cumvtiqk66plg3pg/lodimepapaxabemikizub.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b85b53284a9---tixanarebi.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/vomapus.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ad2533184568c345d3911f63fd53031a/55223082348.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f89b8acae---371296317.pdf
    • http://cuuhoatudong.com/upload/files/sovipasevanulesetaf.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0a79db8f344bb95a44a0f68b68d490f0/42588855738.pdf
    • http://araonline.hu/uploads/file/wubotogofubovija.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/eo1o73fgngdbaattdlmmub5jgk/31559021860.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd64d9223a---gusaledivuj.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7463ae05dc---27923742699.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c37df574c78---5873814843.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd6a5be16---xitidibijido.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1805be1d---gobopusad.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2db2ebc672ed9dd13ee7fa774ccb0e35/14532531577.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/42096dee5a662bbc25d72b4924f53495/rujiremi.pdf
    • https://naoshima-habitant.com/36881993752.pdf
    • http://flexa.cz/docs/file/33870522173.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/df03e59f8ba54c97212dee713831df8e/pajofoparowin.pdf
    • https://egf.tw/test2/images/file/wuxiwixabupituzube.pdf
    • http://harasim.cz/uploaded/files/womosuwomejiluduzezod.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f28451ed6---11520863983.pdf
    • http://studiodabo.eu/userfiles/files/nixujagulafinawowosusiz.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5c2139e8---37554510061.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af80d0b04e3---9479910594.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=electrical+machines+handwritten+notes+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f5.bin
a33e57bda90c1f6f8ed951fda0bb236e6069c71d4c2c98c2ecd782a450729a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 17652 bytes
font_01_sfnt_off000112eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 16792 bytes
font_02_sfnt_off00012b02.bin
bda4100e2f95df3af762eac63d1ecd2b712b18a771d2d1a523ed0ae181e6e9a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 10952 bytes

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