Malicious PDF — malware analysis report

Static analysis result for SHA-256 0753ddd4cf29f0d7…

MALICIOUS

PDF

81.2 KB Created: 2021-08-16 13:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a8ff04e9a3e940b23b2f40bda58547b SHA-1: 60108caad437dff632f6e488d98183bb1c617dad SHA-256: 0753ddd4cf29f0d731cdb147aa580df71acd24813a5c4650639dbfd0efa82c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=what+is+pecha+kucha PDF link annotation
    • https://sailstudy.in/ckfinder/userfiles/files/sazalel.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/famiporafonukisikolug.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad16671425c---75169228347.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c359a3999a39e2d84ceacc437e46d109/nosasiwepevapajatixil.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbd81daf5---jidepepavozaviwuk.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1627403848.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zemuzekekewegajevas.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/84220596972.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/79446053111.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98c7c8da6---34524321825.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/37226064187.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/38394979490.pdfIn PDF document text
    • http://rilta.net/userfiles/files/72206042503.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ead6cf369---80105812855.pdfIn PDF document text
    • http://df-foundry.net/d/files/64367275498.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba111422c8---82579477667.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/semamuzitojobovuwizivizu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/673a301bd4e5e1599a7473accaa2d60c/27435250071.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/wovuregupinarik.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/10040745222.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/93041766424.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90ee23efc7---lakodiwog.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/mikarolesilus.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/78151232157.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6d493ea54188ededaf6b1b08feac2ecb/xosekazegomamujojuxebiti.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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 16864 bytes
SHA-256: 116283623050eed3cf4cd29ba51425028d5917021b4747c32213f010847a945f
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 10284 bytes
SHA-256: cc42b136218592e322ef82f15a0e1777571575b7e4e84302cf8b8fc80fda8922

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