Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ca04e3d2cf6e44…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 07:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 921bb0ee2e53df5d7223838b5afe651c SHA-1: d07c48d1d662064a1dab7b2ed2c531902fc5cc59 SHA-256: 61ca04e3d2cf6e44b04132bb4b6e7f6b003a779cd9f8031fc9c8fb46f6ac41ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters, common in phishing campaigns. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=how+write+a+debate PDF link annotation
    • https://kligi.viart.lt/ckfinder/userfiles/files/54129170326.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/83313027018.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/76181e01543be60009fab19bed445df9/65416525063.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/18421817929.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/015878dcb0261129ba4824105b5735ee/tezakagasuguwo.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/4359883118.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79c535f83---nuxijugexigujeburilid.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/42591818941.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149251a8ca8e---90272389807.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/gevibeguzemuwarafi.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/92459661257.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tg8734iaorofs297ufmkv6tjvu/74026784992.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362672d4d5f---7865926176.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614893d57fc05---pogukogekaresewudupusi.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/96371970180.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/fatej.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/xekimozezaku.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/xowidopovogojinapawove.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/vusevanagof.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/favowowewadubuf.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/nelogomexabinix.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/85679449992.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/nidegaxibogakizagaz.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/junidejulijusazaf.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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10140 bytes
SHA-256: c4ade84a1516e186b391549d8253ede89116cdfd0c67e99a34a778bb06a9b446
font_02_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 18112 bytes
SHA-256: c9132b6c7f9a4576446504a2f0113b09bc478cb9e786bee19084345a6d17c6af

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