Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d16150036e04ae…

MALICIOUS

PDF

86.5 KB Created: 2021-08-01 09:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3bc759014315c75693956bf1fa25ffc SHA-1: 19fee8bfd8737b52c497e012a95c68f902ff3c08 SHA-256: 94d16150036e04ae4a991ade50c261336a175a77f1f17ddb2fd76ee93fbf3255
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a social engineering tactic by luring the user to install a browser extension or update, a common method for distributing malware or stealing credentials. While no scripts were explicitly extracted, the presence of numerous external URLs, some hosted on compromised CMS uploads and disposable domains, suggests a phishing or malware distribution campaign. The file's structure and embedded content are consistent with a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://2ds-creations.fr/userfiles/file/fadiluz.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5ae4abe9---vopakeboruxetiwixuw.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192a57dc52---neboxezuxika.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/kuzopezakewubagovojiz.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/44649395421.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/pufawifaxamaso.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/58927436812.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/phnogu54p84vqdrbehga38irpj/duzaragagiteti.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///20574218716.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/90013529934.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/4363360378.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16104442dcb88f---51305937935.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/a966o7m3od815063sp8o7qfkj7/segetukakagimu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/e2llcea03q57oiif1sf6sj48n4/zonidugedukatigi.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/34359229612.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/jetovikaxa.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/91599514864.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a503f775f7b---19003888153.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/wawiruzegabutuwuxapisuma.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/toxax.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/64276433340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+change+a+kindle+batteryPDF 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_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 17000 bytes
SHA-256: 1c4286a778cc68f8689593853c0a82d3a9a96eb00e0f85c326f32d2250970ff1
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A4 10904 bytes
SHA-256: 905b608c658665a943aaa18d4d2b496a7a1173647ca26b5b25c3452ef101f545

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