Malicious PDF — malware analysis report

Static analysis result for SHA-256 235b2f7e71df750b…

MALICIOUS

PDF

111.4 KB Created: 2021-06-27 03:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4751dbaa15de5e78a74a36cf4fb6f701 SHA-1: 435f22fd151e083673c3ebc842f631890f65813b SHA-256: 235b2f7e71df750b1f2b690900dd2bb100c609bbe5697fd5028871f76b98af23
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites. These links are likely intended to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • 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.
  • 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://burelomdo.com/ckfinder/userfiles/files/wexiponuwepanubukij.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146c8b2adc---nigewofafobudugik.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a26d63fd---woxusuvubojelupebixet.pdf
    • https://detector-billetes.com/Imagenes/file/40958839579.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b84e7d5a---xeguwe.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607239e1ee32a---8438283853.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/6khhmcejlib8l0adhjjkfjpp20/sifizaramatuvudil.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/55f6eeaf429e747f1278cb1516d6de6d/44231560952.pdf
    • http://softwarefactory.nl/images/file/64691887069.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/guxese.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac30f899e1---wikijexawulugatufebudu.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bda70b58376---tupotisovinixakaj.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/af3039127ea86273169ee149eebea58d/xovubudobugatukexaduduji.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76aab8587f---jakivuvebovit.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e057d9fd2---momefodu.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba9603c7---duzagezobezovivegarev.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xifopojuruvorovopujo.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4acd9e714b244490cb026cde438126eb/32091032699.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608704e0cc1e8---jodirozam.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/da4f66a8efe07e42933517810a045b1e/vuvuwaxarurudixozuzaruk.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae311e8e30---sedazilafosupewil.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5e9376019486db2963fe57d009852207/gigezigufam.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b39cb02d3---gurelomunap.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836a2dbfa24---mogunogoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+primary+purpose+of+technical+nonfiction+is+to
    • 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_off00015013.bin
6ac10e3a317c1f206802db5cc7b3a718ad3991e37aefd773d8540fd0aa1b9337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15013 10920 bytes
font_01_sfnt_off0001693f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1693F 16792 bytes
font_02_sfnt_off00018151.bin
194e6b07365fba99744aa487f41339026b7751633143e4ed97431ba0182aafae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18151 17108 bytes

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