Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18270a8c73e3cc9…

MALICIOUS

PDF

88.3 KB Created: 2021-08-19 01:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bcf5902f3328de074d49239e56f460a SHA-1: 4e4c709db420957fe338203a67750eeaa34300dd SHA-256: d18270a8c73e3cc92cadf520ad8696b9b798b134203f82064ac8e0fe37fa81af
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://schokobrunnen.com/idata/muwavolot.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://schokobrunnen.com/idata/muwavolot.pdf In PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/53573001219.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af97a33388f---35702662143.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c153c8ba0db---vojimudomutoniwo.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d3657a25---zamufodezifiraxe.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4e7bdbdc0d15d7165465a0aeecd4a299/16362480736.pdfIn PDF document text
    • https://aspirans.com/files/file/jusonupiginenu.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/vimodatejoripum.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/64142103144.pdfIn PDF document text
    • https://kede.org/userfiles/file/14087541852.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/20893018365.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/lipdl2nebco7svhkqtlff66rm6/73379603322.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/fuvedove.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/lirav.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093afa8c204d---34159049856.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/jimaruramenipodasatiwevog.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/vokonoredebukugenutugu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bfd9d81a3c1927688a20f2efc4a64ba4/83355925691.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/939a18dcfd0ecc2cf22056e275a84824/degadaxexekegelufulidabex.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/babudirinasepitotekutis.pdfIn PDF document text
    • http://amdind.com/userfiles/file/95467915487.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/98953277511.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/dokofikiwikatu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a397ce6e15---53908227342.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f7ff3fa42---34716943845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=instagram+apk+indir+2020PDF 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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 10724 bytes
SHA-256: 17a1f609225ecd37cd49a7e76715829a7c1a5c849ef6abade662e5564b96630b
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 26216 bytes
SHA-256: 85dcf1c68509a273785fed1a6832e31b25e9ad55c53e86287e9778d04e74c49f