Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd3215080fa0632…

MALICIOUS

PDF

83.2 KB Created: 2021-10-07 03:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96f2b53010acf7f4953ee8d8fa79266d SHA-1: 4133ab01553b128bc30895c113a563c241181cb0 SHA-256: 1cd3215080fa06326d6e18cc4d612c7cff71868773f615b89f3448c5b93a2ecc
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many hosted on compromised CMS platforms or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://nomylo.ru/uplcv?utm_term=country+ribs+in+oven PDF link annotation
    • https://abofahed.com/userfiles/file/wilosob.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/dokojivakufisuropobi.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/69836750951.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/21141693860.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/45226760130.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/45184563291.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/gudujurox.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/79429012502.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6f4aa8f5adc23e1827715e1305597102/3332039697.pdfIn PDF document text
    • http://bndweb.nl/upload/files/fixozerivebemabe.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/dupifubefif.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/bebofuriguxepo.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/78363622793.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f418228d207b991f4bcbf1a77c1fceb7/64572079442.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210905050113.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615d38ce5189f---89100782816.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/movixaxukuzilixu.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/lebelekugijo.pdfIn PDF document text
    • http://na3.it/misc/file/zevoleliw.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630516075.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20211001005254.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/vupexapemutikasimekosu.pdfIn PDF document text
    • https://nada70.org/userfiles/file/zesodenikemodidafixusezi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda1a67fa1---teloju.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/44680010958.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/zubenalutek.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/kiwemegurunagipopupanoru.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 18688 bytes
SHA-256: 6aa3fd9b3e71eaa05986d7392de37a4a01e3237410aaad490ac7824b4d3abfb0
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 10344 bytes
SHA-256: bd5d3ab31c1c1637ff3050bf5628525cf22cf48b042bcdee04e168c7d7e8b77b

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