Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39c2d24ba1b869c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-16 19:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f974abc18f94fbd5ca5c4525c79f5e27 SHA-1: 4a7e8e5c23a796479c2cdee70fde17c35043a0ac SHA-256: e39c2d24ba1b869c444556fe82850097c2d52ca35b6e7da1ade0aea6f0536a3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests a potential for JavaScript execution or exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://scriptdd.com/_file/file/benopujevamolufifamed.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db3cdddff9---tisolojimofokanopanenat.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/66489842885.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/98310461122.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/48921040045.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090352625e6c---faxob.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9eccb4ba8---17606575660.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/81765346b3ca0d6c810bc2a719ff1eee/vawogizazifuverolive.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/libomen.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f95821e228---wekobopasaf.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m66phk43c91ha5f8sq446ie0l1/49240331423.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/wajexaliwirogevogax.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210621170243_2043932295.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730bdc605de---40854269733.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f179a293dd0d5c36b0ceb259719e5ae5/10633179004.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b222d05d6---wiwotiluvizumekilogu.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/viwetajut.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/78970849927.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7cc474bfa---geditutomuterofiwab.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/9743716756.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/sikegijuloful.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/adfb0d14a12e791a380ec1480825ba84/vedakupekufonuziwipebis.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e300af133ab---jisowugawolusixewopif.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/vuwilidiferuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+computers+work+book+pdfPDF 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_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 16948 bytes
SHA-256: cc2c6179729a4bb26f4776e03d2fad4d65b16e5023f8da9d09facbcf78e678c4
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 10784 bytes
SHA-256: 436cc1d5991f3896997e1b32c50178735ab6fb45dc161cb98de508f7b6babdf9