Malicious PDF — malware analysis report

Static analysis result for SHA-256 245cc67ffc1280f3…

MALICIOUS

PDF

99.6 KB Created: 2021-07-22 15:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 51d5b45fa1c9deb92efb62ed1288b2f7 SHA-1: 37487d1dc3cb9e9dbf1605ec93a64504297023c7 SHA-256: 245cc67ffc1280f3a6675b04582c1c873db658768c868d473633e172bbff8f39
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection attack. The presence of numerous unknown URLs further supports this, as they likely serve as part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b064f52b---39181379620.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425beecbd3---kowirele.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/56556876429.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/104a639a96e2af96170a2b3dbf12181d/jiluriwetuwitalijaxi.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/luvitasemelesixi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9fe863cd289014d8408aa4c80bad9230/58415405954.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/86684427400.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0cf15d860---64430675094.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/90508278802.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/zusalosaf.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/fisid.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b52b4126eb6e5d3ec9aaa56390df59ed/zigefafewuwidubadijepake.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/26006763360.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f383a4039b---22541300102.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jv1u7m02pns24pbcbuho3qtrup/bixudili.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7ca0f035b---67227442099.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/44651787312.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2689240f8553e5958bdb273d60a2b651/75497566636.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/13208631852.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607032b134519---wipasexipaluluv.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fd6865fd---motavulakixopogetokibidow.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160814cb8d8ca6---jibexavapalonavup.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062912054679.pdfIn PDF document text
    • https://kede.org/userfiles/file/16788309625.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca262e79b---nenofonovobesuku.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc248e610---59254100859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ic+01+principles+of+insurance+book+pdf+downloadPDF 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_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 17376 bytes
SHA-256: de532a6c379dbd0ee14cfaf398877a1b4c1090b6df4281e91e32360caf2fb85f
font_01_sfnt_off00014d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16517 11056 bytes
SHA-256: 3df5ffbd7451bc6070e9ca20fa5ef3871fa936f5ae97888bd5e0fa6b016192d1