Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9f313e12a59d33…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 08:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7511fd82378bdef0d916ef60ea8736ed SHA-1: d00d6784d642082a17d806b6753d3641a5329371 SHA-256: 2b9f313e12a59d333bd914c4ac5ddce5f37027b374edaa9a9edfb4c75c657015
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS upload storage or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn--80aamwn.xn--p1ai/userfiles/file/vojunuponob.pdf In PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/8364992700.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/49113530146.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/89905358886.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b45a097b---18052850468.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/63433574687.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/dobedaxoziwobujuki.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/82459217566.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/vobejozekemomoxurirajuze.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130796f2013b---15596866452.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/tafoxuriwavoposewovoxe.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/18653997338.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/sixilumunuzogulidimuga.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/2779969020.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/68074088181.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bba05bfa---8740606324.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/wexewizurogatijo.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/bugivarafejadaki.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/58111016548.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/mabibalawetimorazi.pdfIn PDF document text
    • https://maisonforville.be/documents/file/nosedexe.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/16072247694.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d2e81edf---23797894799.pdfIn PDF document text
    • http://flirdining.com/uploads/files/vaxogugibirokujaroma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fallout+shelter+unlimitedPDF 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_off0000bf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF87 16828 bytes
SHA-256: 7686d785ce7e029398596ef900b967c66c84e13073156df604aea1804764ddd2
font_01_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 10592 bytes
SHA-256: 52d83780248a511f4f6690dcdba7ba33da303255b8dbbf6c799742632b57bfa9
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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