Malicious PDF — malware analysis report

Static analysis result for SHA-256 082166f7f7a658f1…

MALICIOUS

PDF

83.1 KB Created: 2021-07-19 07:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bdfdb033b7a731859ccb0a76470b7646 SHA-1: 7a7e592f4e69c4419ced0878214a1e9936d45be9 SHA-256: 082166f7f7a658f175b54ab716393f9d84beccd932d274522d935abf72ff63f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beergolfers.com/blog/images/file/tofejefatumizikawuvuxotub.pdf In PDF document text
    • https://burlingame.com/wysiwygfiles/file/54848337456.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8182dcf8640c53fc34a4ab4950f88962/43073068328.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/ravolezogarojirilemawu.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/13561608365.pdfIn PDF document text
    • https://parfumzone.ro/files/file/69226376845.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/19060621f8b5bf50acd7be6303fd156b/54700124621.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/m3prgegjtmr45khjcgg91temc3/kujupemudawedijimiponexe.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e3aa4982723c1333ba3c99b4097915ff/wevux.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071d4088f2d1---17409226543.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/rumujiwileneb.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/wanowedakeguzujotol.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///kokanetopegal.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/poxafiwe.pdfIn PDF document text
    • http://simonide.org/userfiles/file/rapodoj.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/re153hge2tn0u0o48o29eeq6ou/napexolitikokegadob.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210517145043192.pdfIn PDF document text
    • http://llux.vn/uploads/files/devijajetudivomoriw.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0b06647432de657ad437e46798bf0dba/gijeferojoj.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/12963805785.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/31651285968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=5th+grade+math+test+with+answersPDF 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10652 bytes
SHA-256: e959fc1dc6efea61f8b6588313149b5be632ca6c908a674f0c2047058f0e1da4
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 17992 bytes
SHA-256: e4d2acdec90e8849c7b898890fc75f14d09f896097f1698279fd82151c4e1f5c

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