Malicious PDF — malware analysis report

Static analysis result for SHA-256 32939e4242c3eaae…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 20:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ae4e79139d54d4a98d9689fb78e29e4 SHA-1: ddc80313147edfef9f3c50123d9618b837fd12d5 SHA-256: 32939e4242c3eaae3a37ce21ead8e7ff96cf1d78a46d1c5df67fde6ecba76821
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or engaging in phishing. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://brahmagnanam.org/fck_uploads/file/53202428844.pdf In PDF document text
    • http://billedbutikken.dk/articlefiles/file/99113547740.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096845e9533d---bebawilusovad.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e4054d2fca638778ef7edff070df1582/37517055364.pdfIn PDF document text
    • http://midel.me/userfiles/file/91986112027.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40597db2b2---wazilarimotudam.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/e46vehpn188c2gja5qf5dlfs99/63768127120.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1c6186536---pibugiliwajunuwib.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c357a8ab7cf1835a63449e923b19f9ce/19474727287.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6de7d6911---61868374901.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ce054990eafec4684c749c7f2ffa2c57/desipaxik.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/83980770269.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/11092603669.pdfIn PDF document text
    • https://agermag.ro/mm/file/22935330437.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/fofiguje.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87b2bb795---24505817913.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16212102196607.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4a8072006b5b731e2c785bdd591af00d/xuwufapogututi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210607223852606.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/lazidigizafiduxig.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/mafudifeme.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c9e4b3a941a1d4be288aba459cc5e337/gisot.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jofavonolow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=imo+apk+download+for+pc+windows+10PDF 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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16444 bytes
SHA-256: 0e6b98312dc42a6d03383b2942ae4c9b23e6f19972a409a5da51314409916f87
font_01_sfnt_off000117d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 10852 bytes
SHA-256: 037b75cb8969739bcaa41b443bf2885fbc5cffee4892876f52da1952591df776
font_02_sfnt_off000130ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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