Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78edd1c10a629cf…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 21:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 082dc9b74083fa4c0d82467f3559fc43 SHA-1: 44cd5043e723654731c90a951124983878391b7d SHA-256: a78edd1c10a629cf161c6a71dfc873a44d81be146f6397ec00f67fddf6d49506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://queure.ru/uplcv?utm_term=race+after+technology+pdf+free PDF link annotation
    • https://www.nbc.com.vn/ckfinder/userfiles/files/45627713526.pdfIn PDF document text
    • http://vitrine-prof.com/files/sawosakutafevijiripatilew.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143db0d3b289---91368004260.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/45181087001.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/46678990166.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/37481997895.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/50333187964.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/79848086860.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/ruxofonikiwa.pdfIn PDF document text
    • http://irollee.com/userfiles/file/44366777938.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/86039602552.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/94893621585.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1cd77b2c---61658866608.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/61368294377.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/14819444391.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139d362c185a---romufeda.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8760b522---34425081959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143475165db9---99946785556.pdfIn PDF document text
    • https://hoongnau.com/upload/files/1572255348.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/rubav.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140baedc413c---54976376212.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fudopujigetusinafado.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/8053245364.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/54434308846.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/mivafelunixex.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/ralazulijunubugu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/22146403314.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_off0000bc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8A 15976 bytes
SHA-256: b17fb01fb62404a39edd9380217ffbd11c3e2889b352e04aa3db054708884ce3
font_01_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10796 bytes
SHA-256: db5327defc1720c48112a0beb129f5b090f3a7ab276772ddbe420db8cfd06cd7

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