Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b759c98bda4367…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 19:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8581c8a7bef9fa020512df354a88ee27 SHA-1: c29bc41fc472746433a82688751fc31f9bc932f8 SHA-256: 03b759c98bda4367b268c85a6e90fea4ed50ef4c38ae39608ce94951dfbe8472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chiataiec.com/userfiles/Proj_Name/files/65840220928.pdf In PDF document text
    • http://cestovni-postylka.eu/userfiles/file/suxibosenivuxajurelalik.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/sokogunimenedezus.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/volizomawoweridutez.pdfIn PDF document text
    • https://anfauglir.com/images/file/nekajadetexitefekotep.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4a5d0e3afc6c5c71f0da1c6c1a6f6660/kufedujipux.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4f76d4e5---fawabizubaxe.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/xetigopegefazuvurepitusu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095eac996ef6---rigikujujasawo.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/89946176108.pdfIn PDF document text
    • http://hongdacable.com/d/files/niludosaranalefoluluderig.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/dezujuzofepisoniju.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/suvagaturitudedid.pdfIn PDF document text
    • https://kopari.hu/files/file/favepon.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ja3v1gh663dpbqai5jbrkcr1j2/jewakajotoxevagomotem.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/3eoas5s9cdra06cq968ia3a3iu/87473856326.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/3437162171.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9f8a688daad795929eb287614c87d135/lolenewelo.pdfIn PDF document text
    • http://xtra360.net/campannas/file/vofasowojipavomuzepusotek.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/4833107376.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262a5cdaa1e---ganomugadodadovefir.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/02817d8e1a9465afe7746a9b10d0c3e6/72624113951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=autosar+communication+stack+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 17364 bytes
SHA-256: affaf35ee336d2c11e71f5b18e36cd00ad1e59eec99a4b0f0d6c6df74ea4f303
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 10776 bytes
SHA-256: 3485d93d711d3867f1de0bc46954cf54dd11ca43ed9185ec66f355b11c56440a

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