Malicious PDF — malware analysis report

Static analysis result for SHA-256 add16c220eaec3b3…

MALICIOUS

PDF

86.4 KB Created: 2021-07-14 03:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d7caada2091f9554532adb4d5eff7752 SHA-1: 1299c325d44ec85f508392d4aa94b902f748dfea SHA-256: add16c220eaec3b39c98eb694f4e168d32fd3993fce53bad51c803494ea58988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://led7.ru/file/losejowefelejekawe.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/98edcc4a85a1cdad20c51c21e42a0e8e/78666357441.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1acb43c1---lamenujasomadawagosi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nm448q3sb4tg72nauujnec6uh0/kidalutijilamufoverizad.pdfIn PDF document text
    • http://metallpress.ru/files/tojatuposipekazasorog.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/79039295165.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3jr7rdp32t4isenk11ofpind76/detikafenotiwutat.pdfIn PDF document text
    • http://18554080.com/userfiles/file/vufipivovaka.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/4350f32e3db0f87497b500909dff9aaf/kutimeginu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jebveqirfh9pl3c03grg29km54/97078873312.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/affb6dc8ce5b65f01dfeb709ad7ef92f/kusozidarujimifavanuwi.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16252663901909145618.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/sibonobufodaxalibifi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c469f1b60f8---wososibitovewejapoboron.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/46195473834.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/24064261692.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fidabexulekenudej.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cnfigsfqhstrfimlg0th68pn2e/sizigukorejalaxoloz.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/wogodipanexo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b474c4d2dd62d43ec05cae310b777863/72974182370.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ea7fc714f598a3f3c3f77428298fa8f3/subufuvokizugevoref.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/24097278146.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/63019644363.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/df8dbc7e9689e209248564be9c54cec4/nogasoxugoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sims+4+cheats+ps4+cooking+skillPDF 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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 10968 bytes
SHA-256: 90a91fb6b21a5c7d1597109208b9feefa13e5b5cb3d2865e684046bc24616a6e
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 17256 bytes
SHA-256: 0d6f4f163d3ed31b9c22b04928860700381ee4f145f0ba1fd652b1a6662d0817
font_02_sfnt_off0001343a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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