Malicious PDF — malware analysis report

Static analysis result for SHA-256 24445f5ed2b4b18b…

MALICIOUS

PDF

89.7 KB Created: 2021-07-24 15:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e98fbf2bdefce606f8774be9ce02ded SHA-1: 619807cfbecbeeaccfcdae83a9cae3f693691de3 SHA-256: 24445f5ed2b4b18b2f0725abb9429b0ab7458dd6524713c0f19518ff69b5721a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/76410218848.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d2aa5099---lazurawolafuramudejenuti.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2h6k3hkclivlafsbcak692d745/xewerupalevijinazepexu.pdfIn PDF document text
    • https://keongracun.org/contents//files/66268887378.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/gesudadezuwedajabeja.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e9dd6197ab47256abdde244ec1aa0c48/79728440267.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a950a12f066---suteputexaf.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4961f6ee5aafe5d895a0fe84c231842b/75313307569.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/sonerolejobuwuwara.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e3090400---petizanojudego.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/xodobubuwatanosiwuk.pdfIn PDF document text
    • https://abeess.com/userfiles/file/78630307569.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ripisobazaloze.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/iui4d2jl5k03ibetkm8ktk9iv3/kefeda.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c17dfeef21---mekojin.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/51514522821.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/pukudorenedege.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/dd140cbca35240ee02354883142a4d5d/59575091538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=c%C3%B3mo+convertir+de+arrobas+a+kilosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 18984 bytes
SHA-256: a083a1b68c198740c808e6dee41da4db633f480c818ee12b442070fa54b22f4e
font_02_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16436 bytes
SHA-256: 44c88801f41143e5b3698b667d7c4398fc7c2afa0b037f3838d032690ff3709f
font_03_sfnt_off00013d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 10996 bytes
SHA-256: cd31c27a0f946a4ad12606ac746c9c7b53711a4c392612d2cc25a1c81a5418cd

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