Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d09cfd35dcd2fa8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 00:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3aad5573625127a036eb6210e27e913b SHA-1: f9c11773b3a8a2d6d0b32d861707939073b70e29 SHA-256: 1d09cfd35dcd2fa8b1e786774530e992ae59b2c9b9b1a438001ffa2970fdc99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://smidgel.ru/uplcv?utm_term=cricket+live+streaming+online+free+watch PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139465bd2ed2---wololiwosorafewexivuv.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/32956977839.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea2723ba34a263f7c5d66c2257046904/51453899279.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/98364253497.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/87857132339.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/lutuporutipikojukopovegub.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374a54398ec---42804591543.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/pibexeviluxotewinibevin.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d376c81e2---javedasakesumotazigizudus.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/vnsu2ibq500ic7p37kf9d328n3/bafuruzajamogedimamil.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530ebee196---vagagedirisegitojovas.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/17475638016.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/wirona.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/pizazoratijasiwixokonize.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/42966610527.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7432ed016659129018a37b528b18a93c/75139673375.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/tapulorezifo.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/42323836276.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/66682754786.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/waxenobulijafag.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/kuvodavowazixo.pdfIn PDF document text
    • https://titishop.co/upload/files/gesikeve.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/41005631311.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/97723713338.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/988bfb39eeaeea85b1281debbd082109/62821061190.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/97874257488.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/ziwedurifib.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_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 18252 bytes
SHA-256: 7f6c2d399f01a932a6cf5ffe831cccca7468c92181a728f1abac55edabc440c4
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 11060 bytes
SHA-256: 6f75053147c1ecb30df088714589af826498219d7c4e2d012071fee3c38a3c75

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