Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e36355c7e6117b…

MALICIOUS

PDF

97.7 KB Created: 2021-08-04 03:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e364f252f68f8a5054c5afef49fea2ec SHA-1: d2f892d60b250901e003ef46af1f81ce5da5dc88 SHA-256: d7e36355c7e6117b88f778ed5bafac965718a916a80bf83a9bdf6cfc668421a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to lure users into downloading further malware or falling for scams. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://techson-cctv.com/upload/file/94964523687.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f72aca8fe4928c432fd64181e46b8ddb/54534721076.pdf
    • http://wildpflanzen-planung.de/file/xewoxepizuwodegegugafupuv.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075907631da7---26343935252.pdf
    • https://ville-saintleonard.fr/pdf/zuzarerapeluj.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/750cc8e9bfa1705311dd207b2da3d598/getifojuwunenisipe.pdf
    • https://palezieux.com/ckfinder/userfiles/files/24296147504.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160998281c0f13---xevotobijelosan.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/j2o8n1pn74kmhis6prok5teio0/vesenof.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/kidosowolufexav.pdf
    • http://toyteepee.com/uploadfiles/file/210715224947666127nictig.pdf
    • http://matkinhantai.com/luutru/files/51798797494.pdf
    • https://fishuntpesca.it/file/54835714963.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086580840a24---rezuluminitadegaxof.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/125da0f2cec109e1fe9d807c3143a358/70043448962.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/u1b8de290qvmv8rpmhvbvigmg2/67936253030.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b479b823---72648658498.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4e31c0dd1---lixojoguraleb.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a74e5aea4dcd635d9067c56fcb572bb4/wolami.pdf
    • https://floridainvestment.cz/files/file/ponababawisupigo.pdf
    • https://bitree.ru/ckfinder/userfiles/files/bupibar.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f41176b515e9080d401012898a1fb6ba/83804542151.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0a3332b2b7f5af9458455c4c9b07591f/monuwujotonenur.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/egjn2mfkrr0jqk38bj0ispe7so/25817232463.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9688429b5---gevenavazepalijefe.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d28b622697f1547fcd4c3e0ac1483195/sidetozogosema.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adobe+acrobat+pdf+reader%2Fwriter+professional+free+download
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19c.bin
c26743b87dfacdf0858f4b0a7ceb4ab939aa0c8d2a68f1ccae901a3bec0cb177
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 16488 bytes
font_01_sfnt_off000108a6.bin
6dd44059f8182aa99e8f4f642e3c4339ca4094f082ca9f54ffd971b41bb4d54b
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 18400 bytes
font_02_sfnt_off000136ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 16792 bytes
font_03_sfnt_off00014efb.bin
ca4d72eb1d57bd0492afafd86e3bc3bdf205b069ba45c6d7d4633b42817a6486
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFB 3224 bytes
font_04_sfnt_off00015bc5.bin
fb6b0d566b80bc0ad5a7f124bd9023b504ae4c41481d939cb9fde115bf0f6b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC5 10852 bytes