Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18f2dfd72ecc4db…

MALICIOUS

PDF

84.7 KB Created: 2021-08-31 23:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9da5f82ef4cd8bb9487f7ead8681506e SHA-1: f65a85991bb3f6b662182ab6903d33da09a9cca3 SHA-256: c18f2dfd72ecc4db80d3bf49e462d6ce8caeeaef6dd475b29724356257eb512a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. This suggests the document is designed to lure users into clicking links that lead to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://hunde-katzen.at/soubory/317567816.pdf
    • http://booklandbooks.com/userfiles/file/33975616390.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7b100bcc---busipoveditaro.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f3780b9640e80ae05b22a6e2aa4ac359/sofesiritokozomivalimize.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/804a99d32395bdeed7e82517d42eb2a6/fubof.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/44405786750.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ehdpgeg2mnfkc5tjjqsoneb3o3/10295257730.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/91f98198dce3ab61a2dbd023a70ee176/buwefiliduzuxejoruf.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080e084b55c1---337489247.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c70237dce0536944da700f8889a70217/lalamaluvamawama.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7b6a536825f135ed98cac8e223b8135d/46560184464.pdf
    • http://gps-tw.com/CKEdit/upload/files/26601485423.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lepakerodekinud.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f037386ab9d22b584867c1e67da37a44/sisonuk.pdf
    • http://jtylek.pl/Upload/file/21530814830.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c36ec4ed3e---94264041994.pdf
    • https://pinkrali.com/calisma2/files/uploads/makimixelejetikem.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612921746a66f---97093438991.pdf
    • http://inlovehuahin.com/file_media/file_image/file/38145581353.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098442b91ba8---59627396963.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadijoz.pdf
    • http://remont-elektro.eu/archiv/file/44046207438.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=classical+pieces+for+beginners
    • 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_off0000e42d.bin
a5f1e2b13811e9bd245ddd3cba37f1f34bec5f3f5bcf46c8937f77766f9df7de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 18156 bytes
font_01_sfnt_off0001135a.bin
af55fef57d2c3c89ef72bf0afb81520c246bb3472ea3a0f64e49275acbd35129
pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 10728 bytes
font_02_sfnt_off00012be2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 16792 bytes