Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29b22b530362008…

MALICIOUS

PDF

89.4 KB Created: 2021-08-25 10:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db33d41b1e2bf4d828ebf12f5a8eaa38 SHA-1: 7320788eef5fd9feaec57eef173227c124809b23 SHA-256: b29b22b530362008d6e6c910aca48d7dbe71496ce43286bd7c92061ec98a7329
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous links suggests an attempt to direct users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://kayamedbursa.com/userfiles/file/gubaxixolujaxulesulufaseb.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aff1ed352---87457271474.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/45204797230.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/87298949505.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/jakotobujidibivupukap.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f0f66673---bubuzuvatikepilugewewipu.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/90072902401.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160710108a0a49---45815055108.pdfIn PDF document text
    • http://valeneighbors.com/userimages/99354599965.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/goatkr4ghircnluem59r3ih4b6/ruxukop.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/99172817175.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106241738414686.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f13819ca4---59258138526.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/27971632509.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/tejaluvudakewebixivapox.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3db94b4d3---libapubuniginen.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4daa3d94b---49927212558.pdfIn PDF document text
    • https://goldenapp.net/file/wuzuwunegovozurukepu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/55168654752.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/34245283116.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/cslpkspok1nv6fe5cl1oksubqc/96845019595.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/falofewevetezesin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+answer+hobby+questions+in+interviewPDF 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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16796 bytes
SHA-256: 45e817413d5fa4310f3f1721fd4fc5f085a65c5445a06c854047c94bb6609078
font_01_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 10804 bytes
SHA-256: d4cf6c8df75c6562d6e748990a7aa629b4c2a4fb5dbb74ceea1d28bdaa29cffd
font_02_sfnt_off00013f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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