Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c19a72012e4af50…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 13:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9af9fc13baf72161fa094fa5e249f60a SHA-1: 8ebdf9e89ac36c2bbbf75b56237baa1fcc4b605d SHA-256: 4c19a72012e4af5018af19756bcea03f4d43791d594c169c827c086dc09281ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kassa.pl/userfiles/file/kexezuzomokorimemimano.pdf In PDF document text
    • http://www.huntsvillepr.com/files/files/58002972538.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/gedazavasivibitapilez.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tebuta.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/56489720929.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbe0bb313---47458273558.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d67bcb52---75717934774.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e583fbddcf---rotujovozezilijeroxi.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/peguzujalisofegivi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cgme054bbb97fn7adqbc615d3k/xalokezoti.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/81539005029.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/nabanu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/84211262512.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/vaxomonarenipuzib.pdfIn PDF document text
    • http://computerdoki.hu/user/file/85067588976.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7b2d337c7dbc7df9cfb60aa42f7c2ba5/gapebogenuvolami.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/61667257718.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/potebifemebadudixaze.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/24561582105.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/85819132672.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/99976295804.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/lufap.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/61522646997.pdfIn PDF document text
    • https://armenia4d.com/contents/files/46517687266.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/12400037815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+usar+whatsapp+en+una+tablet+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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 11012 bytes
SHA-256: 006e89a25ceefe34044310db167683a87e484e02a8f4bc82804df2b1e5fa1607
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 18472 bytes
SHA-256: eae847b18fe84d8549d02883304c0647a253d188cfac91f7fcefc040fd1cb1b1
font_02_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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