Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1d849a345bf881…

MALICIOUS

PDF

92.5 KB Created: 2021-07-14 05:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4d502016ad90dec3295847dc15cbc543 SHA-1: 164447b6ec39937f283b80a5e21a18fd53cbdbad SHA-256: 5d1d849a345bf88186c83217601d109bc322a1e79e65545f9b4963d0302c36f5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://picinterior.com/ckfinder/userfiles/files/25267494433.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d276434eba4---97578540462.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/21391774564.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/42773836206.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c27efd908f7---gopapuxukivatozuwogiv.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec981ad9678---bazokikubibagobojomat.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/818dc734607d84d74129e21da1c838b4/98494334701.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nodopenogunogimasara.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1434bd2ba---49256831916.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/mefajogevivazetasonuwetev.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/10000689288.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/bewikujaletofiguw.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/roxulutezosozi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f086f853d519b491da7d9e2e7d9abedd/97791112746.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8jlgft9le3vpe1sjh1aubq6tsc/neguraxisutetabisab.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa0c851a0---mefaligovexafudogo.pdfIn PDF document text
    • http://huefpdf.org/upload/file/37032065101.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbd68e33a---94499872710.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/51d704f1004c832ddf5883e9d64cc552/94538236977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=game+of+thrones+daenerys+gets+unsulliedPDF 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_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 11052 bytes
SHA-256: 1ce47a1a95f6298354b98e0a5fcf8ce2f3675df84a6ddb24248a248be52baf43
font_02_sfnt_off000136aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AA 17748 bytes
SHA-256: 0452b9eb8e79418fdb2f8f7f5dfd2a018be22590224c2727c9f351c2bc043aef

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