Malicious PDF — malware analysis report

Static analysis result for SHA-256 98eecb947247367f…

MALICIOUS

PDF

89.7 KB Created: 2021-07-23 03:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d76d7402591617508ebfa2359a083f2e SHA-1: 0a0bbf18a2a095fce4171e4c0c87bb3b5b11fe2c SHA-256: 98eecb947247367f996ceace532c9d5679fb7dc9bf1b9ea3f5af8536999f8e25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The presence of numerous PDF link farm URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://osakadentalcare.com/contents//files/difoduzevajaja.pdf In PDF document text
    • https://angelsstaff.com/uploads/file/koxatarojefudad.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d9e17ff36d83ccfac85711ef528f8cf0/23749681696.pdfIn PDF document text
    • http://beta-rc.com/upload/files/libezifuxutorukunuvojosan.pdfIn PDF document text
    • https://avenue102.com/uploads/file/28932055282.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/nifedi.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/14572623912.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e6953aa8849fda80b5e9df26eafcb7c0/wisajisijuxufigutilu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97e7e0c58---nititapodipape.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/lifopuxifisafajosug.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/vozazevizaxijorekekexa.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l3dffvnhipl60aqsucu8c0e7bf/52933616924.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d5ac43e0---12922843596.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/adb35c6e9f868b975ea0c7752022a5bf/61991270590.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/gojugaxakatoposukivaj.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/81455841271.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a948ad4be46---dofolinam.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/47139421371.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480830e6e5---wetekozawovenovupabokop.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/zuguvulawosot.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kipagowibin.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05025b641---14248380219.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/65872522870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fallout+new+vegas+minimum+requirementsPDF 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_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 10828 bytes
SHA-256: 4672be3c847702347df54bbe63f921970e438db4b3de1fbbfc25de7c726fe314
font_01_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 17140 bytes
SHA-256: f3c2f1b5d348a59a5271a45274edf8e8a6fb741601101b391d304d7ca8211d46
font_02_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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