Malicious PDF — malware analysis report

Static analysis result for SHA-256 136c379c17a6d7a1…

MALICIOUS

PDF

113.3 KB Created: 2021-06-30 22:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1f4c1a0137f2d30f2f3bb1ffddf4f87a SHA-1: 5fd48902f834a5b6602f66a9f5f3d894cd89d577 SHA-256: 136c379c17a6d7a11646412c780fa582cff07329c777cad5d59b685653093248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/815b0e549cf38ec3042275c91400c1f6/66135333393.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cce985aac---58061439593.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f3ea084e---16487382038.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210611020818.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/16187046054.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/de49e7e956cc43ebf4a63192cbe72440/95700246934.pdfIn PDF document text
    • http://matras-devison.com/upload/file/kukawebukos.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/54247462726.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/88273633842.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/d70883c7611e3e30f5b1af30f969534c/30906882361.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1eggglv2f83sqg11qf0hjvkt33/tatadipitaveniso.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g3fnkr2vcc6kjeq11bhoc28c83/82678442763.pdfIn PDF document text
    • https://irrisyst.eu/files/file/2997512091.pdfIn PDF document text
    • https://aspirans.com/files/file/fekifake.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/zogurulubupa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8f65b741642064152b1d59931a15586b/84623099208.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f016b79dcd---vanavoxekezava.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/34292685841.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/vatoworedez.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/faf814de793620f0823308b62d5cdd7b/zudonoluzun.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/loxulasoguxavikokopa.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/37948546214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+western+ghatsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9E 10180 bytes
SHA-256: add5f7b19ed7f1c1362fed51ea023cc5e84eb4803fced5362830dae5e47c5ad1
font_01_sfnt_off00017279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A8B 17324 bytes
SHA-256: 43bbadd8bd29cb46d881539d06b84b60c816c8b906cc41c71d1622b4b3c37794

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