Malicious PDF — malware analysis report

Static analysis result for SHA-256 d214611fc52f0a61…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 15:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9d4131929868c591df95ef7f4d39ceb SHA-1: 0da9b5ecd115caa239e01436b9e88a5067c4589a SHA-256: d214611fc52f0a6118d24aef477e27013e46195880e45847867638919930d6f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a network of redirect links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=how+to+change+sms+limit+on+android PDF link annotation
    • http://babyindex.nl/images/uploads/88194225790.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/dagidava.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/kolarebaja.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c3l1qrivbgsjtu1ok3kcpr8eu3/66946277098.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/jekonafefufate.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/53378089236.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/18028394747.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/13891993860.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021917185137170.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/lutuzenukuji.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/58386020507.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210915_204611.pdfIn PDF document text
    • https://izometal.net/mm/file/18501145548.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4db7b0219---lunok.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/77639453723.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/zanefotugofizikufifi.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/88913932048.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/21030016795.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b92f3ae823---zufir.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/57209991881.pdfIn PDF document text
    • http://scarpatti.com/files/9054619973.pdfIn PDF document text
    • http://fruitsad.pl/images/file/podozibegu.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/32858048819.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/geruridop.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/85894858427.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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 17732 bytes
SHA-256: e5d08e341cfb5273b9b2c97dfc7e40d021ffd521e6cd574585cd7f137030047c
font_01_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 10896 bytes
SHA-256: b22b2bc0a1bd4b4176d2d7131edd03af627aef96a3a808beee2c272dfc5ac30f
font_02_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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