Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac0eb360b3ec7bf…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 18:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e741240e606d337d8a08a4581f57721 SHA-1: 33b00c38729fbae01a0c4d39217fae4c6554b19e SHA-256: 4ac0eb360b3ec7bf479a07b181e818c136ac9507722a605e16d7e1acbb28843e
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs and the document's structure suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://alanaf.ru/userfiles/files/rokumokafabes.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b119f3adcd7df4e05177c0935ab1718e/16662168865.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/48210498868.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/topubo.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/13158683083.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/xenew.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/tuvuv.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e8aecc15---45031284172.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/65795653001.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/gukimepixasimuze.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/wemimukopupenigi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2fde14207---xoroxidejo.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/87894665467.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/10891054853.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/91667073488.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/74035092168.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132401616ed0---lerezawilupusimuzatepedo.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/tujemasuwevopubo.pdfIn PDF document text
    • http://sro52.ru/uploads/files/49783959671.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2ed8ab3f9---mupikukokixew.pdfIn PDF document text
    • http://logicamail.it/draft/media/xomala.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210903_141316.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/fifedumakofef.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/zopunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=this+is+where+it+ends+marieke+nijkamp+pdfPDF 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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 19076 bytes
SHA-256: e70876b1efbf68a1214a9eee6d510cd8a4fbff027fab9ef49557c7d6d44517a6
font_01_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 10868 bytes
SHA-256: 81c5f319ac0f9190fd37ead6153b951eef5b80e323744c990ad36ff04b2ecf71
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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