Malicious PDF — malware analysis report

Static analysis result for SHA-256 826182f83f821f4a…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 19:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72b224e0f6a5e76f33ea6142a3aeb2db SHA-1: fc9dea94d4e6a705d82508b569c335a4e50b979c SHA-256: 826182f83f821f4afc15fba34b6750e13ca3f80f6b8f3ca8db9823e1a7e2cbfb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://freehajjandumrah.com/admin/admin/uploadfiles/file/85154368850.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef9acba07---82599392788.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/101cbe03e139a0c8856f6a5d56fe902b/19485592765.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3ualo5onarue071e2ped8mgvd6/99899578658.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/67237990550.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kalemelilugupokamitod.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160795d25cab8a---83410913313.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/tbml4po7finmngikq06e7rn4n2/80347734382.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc1c55478---wepivasaneg.pdfIn PDF document text
    • https://thepainter.asia/upload/files/86921035864.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160789c4ee3fc8---29656545049.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/parodovar.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kelipoli.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/64452987563.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/30787bc46307a005ffdfd8e53b265712/395183325.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/82532549056.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/80467847428.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afae092424b---jigapovegetata.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/12332959216.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vowowalumemenurefiliv.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/lovuxoragewufekuzupofekim.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/5464316056.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tbab627o5g20k6a5m9i09cb514/67884494082.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/386d5f8ccd5e0542bfc6f52ab5e2586c/foxapilatuv.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/44212625483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=we+be+all+nightPDF 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_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16976 bytes
SHA-256: 16c59406ac2eae5ba60f5675bce14c997027eebcedcb13188f039ece84c0c1b3
font_01_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 10132 bytes
SHA-256: 1701b6ce208a116c5e1ac8bb7f0e1b4e4e285cfc7e52d5c3b055256557b13daa
font_02_sfnt_off00013968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1