Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5c7b7331c9fb15…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 12:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03b68342a304a8e80e96207b6f31b983 SHA-1: 838cca2a23c49f9214d37c0fdfa2b851ed4cdd06 SHA-256: bc5c7b7331c9fb159d7613b25e0d16c33037bc0d19e536fe454f52ec0ada006b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://catamma.ru/uplcv?utm_term=neue+version+android PDF link annotation
    • https://allcreaturesinc.com/files/files/wopadadawufuxotap.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/detokazufavijiv.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/36993375822.pdfIn PDF document text
    • http://dfanchem.com/upload/files/vapoporururofu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3b64f197bcf3ea27b5ab6b46af7b0be4/48663689057.pdfIn PDF document text
    • http://matras-devison.com/upload/file/99699754442.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sivolejamomiregukovemozax.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ouamdf4kb0c00rd570tqhgnq1i/41595953324.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109081834156812.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/regepokesasap.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/mejajudugo.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/nojigifovomufudo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/beb161ca567ce00416fea9fe9d5a9d8c/3217762925.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/rigitufemirizujazo.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/58404508259.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/toxarosomavefixowi.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/wodufosifinofusezijipa.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/59065283104.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/7541073170.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/wozemaledonoritozojoxuvol.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/magerareziduj.pdfIn PDF document text
    • http://www.praasia.com/file/files/witavowoxogobewowezaze.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/92435301864.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 17100 bytes
SHA-256: c8e5dae5aeb05179a63e82a27b39b11cddb666a94d54aee832258575540b3cd3
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 10240 bytes
SHA-256: cae0df7e656b70afcc4e43af088cbb86858e8a9c6dcf0b836a97a9e5a8ca1251