Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04b3e9c76c65a35…

MALICIOUS

PDF

100.2 KB Created: 2021-08-18 20:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abbc0ab3a02a8a763ff172a7e28cc797 SHA-1: 4e60c47497830a7ebb5ee843d4c4f46906ce003b SHA-256: d04b3e9c76c65a35b0b70c8444735d0874e7e970d7441206ff1369c1927291f5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with 32 distinct URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The presence of numerous links on potentially compromised infrastructure strongly suggests an intent to lead users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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.webplease.it/wp-content/plugins/super-forms/uploads/php/files/7fn1fbdtli0feca027uih9jhe0/zonoro.pdf In PDF document text
    • https://paidionresearch.com/userfiles/files/wodebopixosifabe.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/88489303568.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d50f6ae9b---teribefelowiluwuvezanij.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pr6hha42lv2dfqhrh3gs94o960/vesosijofatuwevufemojabit.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/lotemedidimigi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa17af0c16---lulilanotatosa.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/vo8gdg9n11pjhqccpnuda5ha76/35382219284.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/71147395848.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f7666764dc19144b176d9578c07f8cd2/duridefinawebupukibukasef.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfdb91521---kuxusadalizabebewopavisa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da8b5e17b6e---mesezunirerizipab.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af985f61b62---beduzedegomu.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/lemobonuvona.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/mexonivowi.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/ketiwope.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/belovabuxufiwosazebera.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/muxoza.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/8ugthgb4m4vlu6jrp779oe7rt0/73208086897.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/5782572051.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/95611581035.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/zopurowomebapof.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/kiworaniroxumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=grigori+grabovoi+say%C4%B1lar+eczanesiPDF 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_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 10772 bytes
SHA-256: 13122591bfa6c7c3058d2c83bf49b1fd507c46e44dfe925d34e0f5935afcec0e
font_03_sfnt_off00014fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE6 19744 bytes
SHA-256: 55dc01c61afef9be5756fcc84e24d472215fc48c92159fe8966a124c7e9d3bc3

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