Malicious PDF — malware analysis report

Static analysis result for SHA-256 37799353c5baaf89…

MALICIOUS

PDF

92.1 KB Created: 2021-09-01 19:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e5d880beec624cce5222fbdb70a1fe8 SHA-1: 6c77b9502094100c186ed1ec4faa4963cf3807e5 SHA-256: 37799353c5baaf896b451820339b2e1cc625e9679460c83ec8ecd3c7b7225938
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised CMS upload storage locations, likely serving as a lure for users to download further malicious content. The presence of numerous unknown URLs suggests an attempt to distribute a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • 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 http://choinka4x4.org/cms/files/file/26248996867.pdf In PDF document text
    • http://kingtonkatsu.com/uploads/files/fenelujuwizobesebarase.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210826014618.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/minatusumusi.pdfIn PDF document text
    • http://citranco.com/users/files/ginomama.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/23309439044.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160791cff2f603---55724483723.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771006b8ae7---gogomuninikexezerobosij.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12d92d6e0---zutegowefemugulo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolivuluxonagotukokumi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/94235de0892ff2e71a1e9cbea4cf6803/81564157447.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/jomifup.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/hn9vsppu6qcseljhfhms4es0a5/55930560749.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/6560541441.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/kevemiranesinunuwi.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/14865514059.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612b913e289fe---89684781874.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6ad123ddfffa6563da641f7fc5020de0/xeviwokiramuforaxebi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b2da36f3---77735369696.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kanivogikumidopa.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/23977707608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=simple+past+exercises+irregular+verbsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/00de03993457acbd689db41eda58f9b8/92091353031.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 21304 bytes
SHA-256: 23ccd82886a9d9791ecf080e847395ed1bc2acd36796cda3bf46bbf54989dda6
font_01_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 16352 bytes
SHA-256: 002206b88d26d4e98ed024f396d06a4995f1ea64dec2f3c06384c384b5bb893b
font_02_sfnt_off0001306e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14885 10976 bytes
SHA-256: e01ea77f21495d90ab3e06f13518afd546aa31eee50f9913e9689f0cd24b04c8

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