Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3cbea8f74302af…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 21:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40539779bd74028f83ff40d1bab1a9a8 SHA-1: 1da92897998d93271d6b535fdb01b155a3681040 SHA-256: 3e3cbea8f74302afc2440c693ef6ce2e3d611fc36e5c75b86ee8a5ef6a8c0080
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host a collection of links for malicious purposes, such as phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=mods+for+battle+cats PDF link annotation
    • http://webinaris.org/ckfinder/userfiles/publics/files/nawizi.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/62403961506.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/91188476904.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e6453df2---16745084481.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/82013693242.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/53640903212.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53266ea5f---89759366681.pdfIn PDF document text
    • http://pedraferro.com/files/files/14022824869.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61911071291.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/71861668367.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fabc3ae9c---rorekilevawepobulomidi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/kaminubasokawa.pdfIn PDF document text
    • http://schokofontaenen.de/idata/13064430986.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zesilizezolaw.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/74952656963.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/20fe4b928b32e864f47761de6cb8b64f/finegamatufapaterowuga.pdfIn PDF document text
    • https://linker.tw/files/64638569024.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/15510222310.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d94e9d9f9---xasuso.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/gabuzatemezusa.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/tavukuxulolidowasebewisi.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/28691998869.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/terupoleninakoforoxuxefuf.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b9b00a911---14336420079.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/61902240313.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 18180 bytes
SHA-256: 2461c65521a6bae7cc373fd303c467bb57d461775561dea2953b6e0e20335097
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 10408 bytes
SHA-256: a5751d305457c2f5dfdb3ea4a8897e7ae1a8c22054d04560eaf944ffe67ba32e

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