Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73da8dfe40af88a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 04:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de54e6eefc7353298e835c2a74ac7c77 SHA-1: c87d1ac48c88fea9adc454c4db0ecf2df23ea010 SHA-256: f73da8dfe40af88a761f2020345718c8a727aaba025064e884c2c33c7b56eec4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://pixomot.ru/uplcv?utm_term=how+to+set+a+new+ringtone+on+android PDF link annotation
    • http://primaria-ciocirlia.ro/media/file/dodokamovekopisigigemisem.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/63076415460.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/bujufapajawupuxibojerado.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413030cc62---zezegiloxajaka.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/70377838730.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f8971537eecbb9e109a51f0948e5801a/72385342165.pdfIn PDF document text
    • http://eternoohydro.com/d/files/50915697917.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kii0eo31ar7f0n2fbp6a4bglfh/16004461058.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/sibosek.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/muvopevijoziroxeturegijad.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/mujidefas.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/537fa234dfcc3bfa3452353579e97f37/wokeros.pdfIn PDF document text
    • http://net-work.cz/data/file/miwemepudediwisetaruzu.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/44554763931.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/45e6812130353f8084b3becce233ed92/37474909237.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/73779068913.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/42553574579.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/fidulalugigin.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210919193151.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148432d217db---zaxebofebi.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/64001511983.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/61708374602.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/walegomosoguna.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_off0000ae4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 15204 bytes
SHA-256: 575b66d761e5c1a0531d03cbf97d02399b11ffd674ac73f7c3e422e0ff6fbae1
font_02_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10456 bytes
SHA-256: 59b02507af80ee89f0012d6d32196ede7b77c06b17956ffbf3d0e3841974af21

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