Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcaf5a5994ccd57…

MALICIOUS

PDF

90.5 KB Created: 2021-09-17 18:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69e78fd6f99afc1f168a0a0426bb73f1 SHA-1: ff7936ef1028a098ea26bca01c6a5df7def65055 SHA-256: 5fcaf5a5994ccd57a89e62861aaf891018c0c9aadff541833771b7afc608effc
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://12waktu.com/contents/files/gividodejafut.pdf
    • https://gsacademy.ge/uploads/files/98927528296.pdf
    • http://mobydick-band.de/fckdata/file/bagozijilodavuxirinimarom.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/0240f9b5b275ad6318e410babafbf112/33802933261.pdf
    • http://obrienbuilders.com/userfiles/file/sibiwidovikabuzalejaxed.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/85768648184.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/53024234328.pdf
    • http://askaudit.ru/price/23543083200.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139468784123---rexotewikedewuj.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/lawumixuzazak.pdf
    • https://brillimet.com/uploads/files/202109050409395858.pdf
    • http://bienbao.org/uploads/files/zidur.pdf
    • http://mamam.by/upload/File/file/98097438655.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/55192199549.pdf
    • http://labonscafe.com/userfiles/tusawizotogiduvu.pdf
    • http://xlpe.net/Images_upload/files/sixozib.pdf
    • http://adhunikjewellers.com/ckfinder/userfiles/files/lefipowujamaf.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1e9a8f77e173e12863f739dd51a849f/nujazirogevokuvuporinemef.pdf
    • http://mamam.by/upload/File/file/zeliburavinamemepitetuko.pdf
    • http://jrpst.pl/userfiles/file/86496523313.pdf
    • https://parlagame.net/calisma2/files/uploads/jarapolik.pdf
    • http://udokutscher.de/gfx/userfiles/files/53777584964.pdf
    • http://lobi.md/userfiles/file/67185114683.pdf
    • http://mueblesdepladur.es/1/userfiles/file/47984210917.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/vowanitizi.pdf
    • http://fresh-j.info/images/uploadedimages/file/bopijo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mind+hacking+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc6.bin
cd195bf91630cea5b0c12207eedfcc4bafc95b483239f54daa0755fb00a13ded
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 18796 bytes
font_01_sfnt_off00012ca2.bin
c69d9c0f048b1b9ca5e2b6155c059c1bbd0eccbe42597d3def8e00f100881745
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 10552 bytes
font_02_sfnt_off00014460.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14460 16792 bytes