Malicious PDF — malware analysis report

Static analysis result for SHA-256 544520e95ce43031…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 07:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a96645b868ca9cd5b197f113fcbffa7 SHA-1: b8763338ca0df72bf45dbcacca8111b957c09470 SHA-256: 544520e95ce43031067cd36b00882f2d77205b0006cafcf50093134bd56d3d35
196 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a high number of external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm. The primary link identified by the PDF_RANDOM_URL_LINK heuristic is http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/83263265320.pdf, which likely serves as a lure for users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/47840470715.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/mirobixapakanepam.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bb98d6291fc26cb6d50475fa99eba1d2/kufakazenudanelozoloxu.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/83263265320.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210904083131.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wakabufav.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/perudomefifuxufepejid.pdfIn PDF document text
    • https://ptogel1.com/contents/files/newijizagafuxa.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/97302040332.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1728daa60---pefekagebubifosijibi.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/10680312744.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q334uckq8epodlbnped5apsku3/19680854704.pdfIn PDF document text
    • http://briztravel.com/upload/files/38933834028.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/denedoludipepokojivorono.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/25780484268.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/ponulamerej.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/tccepj7ttt6plnfq1dhjc5utu3/72507652888.pdfIn PDF document text
    • http://fedime.org/imagenes/fosal.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/nuvuxejizi.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/69302535284.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/3506589424.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/sorupuluzenubozimob.pdfIn PDF document text
    • http://apsons.eu/files/file/42318558709.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b640676a10---67782648521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gangstar+vegas+apk+androidPDF 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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10720 bytes
SHA-256: 52e6ca371aa26eca5b37b313f10153cfbedaef4905b9e155d74fe74ce6258704
font_02_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 19880 bytes
SHA-256: b478c16b98a157f23ba6cf4f535525621da5f27be3807604d93f5e5f7e38c14a

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