Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a6ea80e81483a7…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 22:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: adc3a39e54d7454e4c20400b975a8ee4 SHA-1: a971f0186bc756a7ed5793d6652c1de87d09d191 SHA-256: 38a6ea80e81483a73d4c48013e15a1ff0a23d7c926ce5bcbcfc79188c871c531
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. This suggests the primary goal is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://eltonltd.ru/sites/default/files/uploads/99230057394.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d01ae61efd55d06fd5ef3a97eb967295/68293294803.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c12484b566---jebiperekifi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6ded3f65---32909500343.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q7p87m8mpsiuvbga96k41ft732/litiwiwezigebunowabe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512dfefc83---20683073710.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a17b0ee2.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160897b46dd44f---55232082913.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/puzixenaba.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/36778005586.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/27683046072.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/mepunesawufemitowegafo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dcaada5d6---65440070469.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0a99ea99fabf441c209407a439fd2412/85415783392.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/1501937478.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e8175f8a5---sakevi.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/93294095541.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/lutedupofud.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e0a05dd52---79516607848.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608212bd93ffd---1452133634.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f9a70573bcc5bef9d0a08a7d089f0cae/memeta.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/dunezenamoxajivi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e5dc4fdc---tekovozisolebozogotakizud.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lorekogigakunib.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/napatogudodejite.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3ab50d2dfcc79f068f801884000adb74/39302548856.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6c5a61a0---topip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=about+edvard+munchPDF link annotation
    • 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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10616 bytes
SHA-256: f8c36eed75ce1c713a7e7c3905fa8a8ab8bed5999575ab255b986f96cceb0a26
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 16836 bytes
SHA-256: 2da864c1dd151f0e1a3444a08d3c153c082b02ecd96aac14bc34e913e044119b
font_02_sfnt_off00013374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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