Malicious PDF — malware analysis report

Static analysis result for SHA-256 a779e6e74529fc74…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 18:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab68896aad7bc50d16264d449700b7ef SHA-1: d0b1493f14254292e4d2c0d181783ed871247a0b SHA-256: a779e6e74529fc74ccfdc29562afbe052840f596b5af6403b3d821f236710530
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=internal+audio+for+android+9 PDF link annotation
    • https://jensbrode.de/files/file/fekerobixur.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340a0097a35---67214956165.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/bitevulematolaneruwajuj.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3c4692c3---kamatitiremopakuxeda.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135b35dafc5d---xigixojurapajozawopako.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/vigobutijiligidegatojobe.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/63213468014.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613571e299fcd---16651111714.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131395643ba3---6332516172.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613798cca0748---sipemugo.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/jonaribexozud.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fb46105---jekowidepudimuba.pdfIn PDF document text
    • http://bubb.cn/up_file/file/molalawixavimozonogome.pdfIn PDF document text
    • http://seritour.com/rsm/files/27922864679.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zexopevukaje.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/gidumipunabejorizururoz.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/48442240230.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/bovowun.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed52e73d82---xifapezoxibopinoj.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/wiwuraxegup.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/logujilatoriv.pdfIn PDF document text
    • http://jfe.hk/userfiles/76124239887.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/91039306333.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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10396 bytes
SHA-256: bdf4c9171bea04d2d51bb895cc1ecf94783de6f09caf9437a79ad9998eb52a16
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 18528 bytes
SHA-256: 4c49ee7babfac5cfb2eedd204b23330e20e16d0a3e168ac3e2416fb2e4c727eb

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