Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbe5eac9cc0d9e9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 00:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4d3935dfb7c9ba3d3d31aaf3c5185c8 SHA-1: 980fe632d0b39e75a2230401fd978d4650d59fff SHA-256: 1bbe5eac9cc0d9e9cf119af6434d10940e5609364f6a52e80a6375ca9643ef1c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=android+app+that+compares+prices PDF link annotation
    • http://abcgsgeds.friendship-match.com/upload/files/57428560730.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/89295802064.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/dizafora.pdfIn PDF document text
    • https://iohrp.org/f_files/files/60099721999.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/zepenonilajitarubotip.pdfIn PDF document text
    • http://besteva.com/upload/files/tenagipogir.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021936483.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/44024468859.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tewunegugabejipamikezixar.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16309634013031.pdfIn PDF document text
    • http://smirna.pl/files/file/vikejoripurekot.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/tapepotibakefu.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/notimajamoriba.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vinexibexega.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/zapixabexipajibemevetad.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146565f18218---69593319518.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/2087885995.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/h95o995d7p9na2vrpi1l931bu9/85043445140.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/38497197793.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/91339346552.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/funumude.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161432a6d2358b---dutapataretuzufejiv.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/20009450866.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/18722238839.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pujabelidodol.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 17544 bytes
SHA-256: 4f5b4c5d4287cc72f3e84cef5cd18358038d1c6fae5e6facf5a7a5c1fceda19e
font_01_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C9 10716 bytes
SHA-256: 8abd5846d9d85dd47da6c72bb8864bfd081f9c0010d9aabd2383efbd5486dc6d

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