Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37f5aac10ab43b5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 05:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db7aeffee0ed111951cdfd2cb37042fd SHA-1: 305f13717f504767c2d64d22d2750e502433fbaf SHA-256: f37f5aac10ab43b59442d3f36314c99513f19fa3d17c52700bda05a7b0c7da78
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and the ML classifier also indicated maliciousness. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites hosting other PDFs. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6c34ce34aaa40283829b6d15eb80f87f/kavodebipagipaje.pdf In PDF document text
    • http://mistral-paints.cz/userfiles/files/nejufagubelipi.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/mutidevowad.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce4f7d8101---86307289339.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/204d7bdf63b9b9e8dfe48de0612dbd8b/zavupilavosunituli.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6fb06a0c---kubolixowebasafovili.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608df6ff7c001---86814656173.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/40510972264.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hj4pb6v5rpk314s9jj4feqnoa7/mupasiripezaxa.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf5d09248---25675843068.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/49009428224.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081423bd2da7---jutotigunisis.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/43425840253.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/xomafeki.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7bf8e452---galuzi.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/liputabedotep.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/16197335303.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907215336093.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/41875497201.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611feab1a9448---3396264844.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/526845217c12d1417be305f83e504ff2/wajola.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/24779313269.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pijona.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/xosolujamevutagi.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/rowufonasinegokivuboti.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/vurenukokonolapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sgx+listing+manual+amendmentsPDF 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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 10648 bytes
SHA-256: 530382013c23098fdf99590dbdec06ef044e551b3a6ab5b94650a5dad3621cec
font_01_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 17076 bytes
SHA-256: 4d80d8dcd6593afcd1dd499eb16139cf8f506b2e6e79e3443ed879f1b73327ed