Malicious PDF — malware analysis report

Static analysis result for SHA-256 754aea9c67a095fa…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 00:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82085aa41444e2d3d1fb71581022ac74 SHA-1: 9e1213d6a5f646885fd2209af923649ea42d7c04 SHA-256: 754aea9c67a095fa2414b4779012d8f350b11b151316a57875edd9b11e9d7b8c
156 Risk Score

Malware Insights

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

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 potentially compromised or disposable hosting sites. The presence of numerous URLs, many pointing to file upload directories within WordPress plugins, suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bamor.org/userfiles/file/xogewazeranigolekoga.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ec1051978---nasujexebewowefedasov.pdfIn PDF document text
    • https://photofetimages.com/pamosiw.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/79215864199.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/99922421647.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/wojuditeje.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5edd2a1ff7ec900dccfa1e324276f59e/94935717978.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161358b9f70111---56564276807.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8f07bf655ce254606d2d03cf6d37fe1d/wofodejojeborojaletuse.pdfIn PDF document text
    • http://ranch.pl/files/file/sifuxe.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/niruleromugezazarexe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/79543a0dfdbb61bd51cec370dbfc9539/funegezubipedunal.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16147a50150251---52827486937.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0038d830ba52948fc2d81a5e81b57fc9/20998679888.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/tagiguregufiworizusu.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/18201757196.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/14200757255.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/17291180564.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/56021658246.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc774088c---gonev.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fareso.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/jimosamikofenofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=send+pdf+file+to+kindlePDF 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_off0000d027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 10228 bytes
SHA-256: d5e66b923f062af5eb75a9e47c4e5b693c96c6d04ebb5b2a71d7e1d777726e0d
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 17896 bytes
SHA-256: 954a8d436fc499be70cdd8bdf5d6d5fca8314d07fb64d1fc827197cd79a47525

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