Malicious PDF — malware analysis report

Static analysis result for SHA-256 a318230fad85de14…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 21:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d885c120854aa47a558152edc707ae9e SHA-1: 7d0cc04e77785655e4cc6cf9e510a4363b9ac285 SHA-256: a318230fad85de14a8bd217d608221e8dc0af338bcacf0428db271ae94c96802
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs. The heuristics indicate it functions as a link farm, directing users to download files from compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=download+killer+bean+unleashed+game PDF link annotation
    • http://purepassion.pl/userfiles/file/benafisovupu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gimixexutogewome.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/zezaxiki.pdfIn PDF document text
    • http://12shio5.com/contents/files/35954744955.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/gowinobovekuloximadiwi.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/degarilaropot.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/fisubege.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907035623.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/gupifobo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/pivapumatibugixegokebuvi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6c6583b89c4fcceb09fbd40e98c58630/35165966145.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/51122074789.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/puvuruxasepawafu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fitowunalizelubukalozud.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/tisagited.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/ligimum.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109120103355436.pdfIn PDF document text
    • https://latework.cz/soubory/41401176010.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/wenib.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/poxexanonenejepifawabe.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/8151468307.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/87681346904.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a63e0556b10a26a7f0185da3cb5ae3bd/32937403944.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fumewejupowiwawox.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 11016 bytes
SHA-256: 18981926378b9e351c041edd536b7dd07710dab904df3251e7d9aeded002af1b
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 17512 bytes
SHA-256: a57e71d235d89e2f73292134aadd0597e7d6cd6be4624d194656f2bd193bfa81

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