Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d705dd73cfd28f5…

MALICIOUS

PDF

80.0 KB Created: 2021-08-27 16:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 419d6452c6cf57cfd27f6cb9be384e78 SHA-1: a036a4571c4bd097d39d974951988e4105b1e691 SHA-256: 9d705dd73cfd28f5f51d2244f0054de47ecda2827fd3e6837b2147046a97fbd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. The document body is unreadable, but the heuristic firings clearly describe a link farm designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://ahreco.com/uploads/news_file/76891364929.pdf In PDF document text
    • https://karinbentum.nl/uploads/file/1732716572.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/6sfjjckefo9oqt1gepfjph1kc4/sazujamewofoxi.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/75865353751.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b021tq0t1pqch5ub3si5kfdk6q/76637991197.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/xexegujodarekal.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/74855989247.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ace36ad1b26---49203059400.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/punuko.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2inaodvf21dfm9l0ih9s4p5k5p/guxarinuzovakofodon.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7e008e72---pirinumibodurelabofiraxu.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/58562341659.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/fafozitimow.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/94412939087.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/64436702570.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vukifesenotuvowapuguta.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/840c6abb07a76c4842c8c52f45618b7d/godopedatojedarut.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/renawupag.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/kikiwesuvulalejadefinuwa.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/dimidikagilobigaretigokej.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5ee254f7596b2ff187803ffaf6ff0350/74488706058.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/41864380194.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/37941354691.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/nuropoxajoxuvexagewalafa.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/zanuluwufozixoda.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/64687707026.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58734754e9---15681858825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=morning+routine+for+school+2020PDF 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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 10788 bytes
SHA-256: dd6220493c55e3e2ab02dd61b0f2aeba1c135fedc8c16aa212464defed2433d6
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16184 bytes
SHA-256: 6fc48c2e54acdd31660300cbbc7458094c492b3b2a60b3ff5ea6290c20a20b24