Malicious PDF — malware analysis report

Static analysis result for SHA-256 684c7756320153e4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 00:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 895feeff8aa2f3c916517f898c19090a SHA-1: 2d3d1c562c9c8e1630d03e43bef5d3b6298c8309 SHA-256: 684c7756320153e455d4345f38992eed5097a9977aa1016e438f0b53719d6237
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is described as a link farm, with several pointing to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Embedded JavaScript streams are also present, which could be used to further obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=boss+level+watch+online+free PDF link annotation
    • https://alstar.uz/images/shared/file/85436358142.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/sujob.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/nuzekotuporepofag.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/wasumedarurinonutoxapude.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/3728112266.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zizivaxajetikesugoxu.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/44008591939.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136479311af3---vutodu.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/telulefupikaxasipagefo.pdfIn PDF document text
    • http://mylodge-naoshima.com/16510728925.pdfIn PDF document text
    • http://104408017.linker.tw/files/79438033626.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/vixarafazerozor.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404b97c2d96---gafozasuwugujegi.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tisesazurotunix.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/40767202615.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/kirobigam.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/376bcfe83ba0fe8b79163720e01b3970/xelenut.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/64386699180.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/89818514312.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/bogavonepisipo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16140becb78145---93637362820.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/ferukuwexixekepo.pdfIn PDF document text
    • 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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 18200 bytes
SHA-256: ce0c381c9107a01c3b194cad714c680f0ffa177de98b2fb0f7376c03bb23a58f
font_01_sfnt_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 10636 bytes
SHA-256: 393ba26e5c38fc22806dcea9ae2c5a5d7d05ec857c5d021f15eba6c04a5c4a5c
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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