Malicious PDF — malware analysis report

Static analysis result for SHA-256 034147c2e742f45d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 23:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 28eb4f171ab98115b85b1ade1309ebec SHA-1: 88be7f8beb258086a5fd89982419ed7c29135774 SHA-256: 034147c2e742f45d96c96ca1271831df3870919a693668c33a3d74a3d0424f83
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and heuristic firings indicate this PDF is likely a phishing or malware distribution lure. The embedded links are designed to lead the user to download further malicious content, such as other PDFs.

Machine Learning

  • Nyx PDF Classifier clean score 0.2429

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mebelihome.ru/upload_picture/putowokewugewep.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2afe33572eb1096ad2a0d36bf27a502a/58047504090.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88a7d5d33---55683787210.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc33b9652---bokalobededojoleve.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lerenivizuzuw.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161143a0646ba8---magagapi.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/nepov.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/59093124722.pdfIn PDF document text
    • http://metall-press.ru/files/76647301818.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6bebaf5e---pazewojopetibonizikagise.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemulomuwidomila.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wuwowemitesapar.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c071aecad6f1cce424af417f6d314ec7/tokegeguje.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/h51h3l7bhip8m58j797cafapo1/gefanirixubosidegumitozo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fubisijofutobat.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/337b01664a738590993e59eecd08c9ef/zerokarewugekob.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/welutuv.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/vexozipupewilen.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xipanofogopozemez.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ad4e7910d---gowerotenex.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/18127566670.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/dikusuvodod.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c766099f5e---kamonifejalapanu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9cc2faa91ff458198c2fac41d61e2064/25068329194.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/dh78foa1ojcqtnh7be52f53oki/25701558525.pdfIn PDF document text
    • http://bloomlight.pl/_bloom/file/pagixomutoxatoza.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/52238125175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=peugeot+partner+2013+service+manualPDF link annotation
    • 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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 11352 bytes
SHA-256: daa02b701ad03c0711fcb749cc5bde45d62e2ae756484e0de40f332f85129572
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 19344 bytes
SHA-256: 841524316731e81a7748b86b4d56da126f99bc5343015e634e6272c3d976ec43

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