Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c929f529fe22f0…

MALICIOUS

PDF

103.7 KB Created: 2021-06-28 22:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 13176095850b37eb044324a9791ca81e SHA-1: 5a6bb2bd3db1cae914cfb70872017d98c019e727 SHA-256: 77c929f529fe22f0c472546e858d1b9ee2d41decf44c99fb144b478bce1b16c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2g259p1bnd4l21tdvoh73l90mj/kimoruwemilojavejagol.pdf In PDF document text
    • http://texmet.pl/userimages/file/86295539838.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/63297240532.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8e162e39---fenotetodezajalije.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e9b44813aa395e265c7090e5ea62fab5/piropawufi.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a3a53ccce45ada2bbbbe73011569d8db/retopipikujowokir.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b9d12a33cdf9247144d75bc274243057/gazuruguzetuluposafizuxob.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/15f76rr1n73rfvdc88fode60lq/53850140481.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/dobemaguwigula.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf43336227---vifipulutujaliwu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608114d9b7e93---95306964716.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3af51924---62356127816.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/v149i0t3k10g7g6u4591jug2t1/93815761186.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/matat.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49c001124---59730596830.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/43o9kt8tda4bdsoobvknpot0jf/jamofikumezewulavedoxesud.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/69206612598.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wofofe.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/mazumesofefovijajowi.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/goruvomuwabukotibesila.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43c92c095---58054318090.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4g89pq0pku1d7fo0jt10ia70dl/75973704456.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160969399c7fad---20280631709.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbc6f0c0c---dederawi.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/88497134412.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ei1327rsgpt5pmpgac80gub786/33077979229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bmp+to+pltPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 9708 bytes
SHA-256: 056baa37a9898dc67b02e309188a7b9f4de5ec035fdb1b40f0ddd08f48b5021d
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 32684 bytes
SHA-256: 3156245795902f36d1e22843f9aba31820d192eccc56e3375217b907d5227901
font_02_sfnt_off00014c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1D 18136 bytes
SHA-256: 314f95cf5532406e115d384c275ddce26e3d64960469f1b73eae9dba2dca4a76
font_03_sfnt_off0001794e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1794E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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