Malicious PDF — malware analysis report

Static analysis result for SHA-256 37abc536001bb821…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 07:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9f22dc22ddafdeab094ba860ba428ff SHA-1: 81a7f42eb6c01bbae4fd38bc32fc5136ad2abe21 SHA-256: 37abc536001bb821f4c919428242e66f8028b2de97b50b681009c134f278b0b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://pixomot.ru/uplcv?utm_term=sally+field+book+pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c580d4cefd6502236b81a1f661397732/pekelunevaxolaritataja.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa66f4de81f---98470711193.pdf
    • https://driftwoodcc.com/userfiles/files/banalituzivobufidazum.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/somewazikudex.pdf
    • http://yves-segers.be/userfiles/files/61291072604.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f0f53kr3hrpfhbhnd09daeoq96/44747325689.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d3b19b879---97989157056.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/56ed5b7ad4e9c9bc6b580d43fcf29eee/wedetobopubevibejobidonu.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4890222c---sotexefarevaguwutos.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/jedafifomizi.pdf
    • http://tara77.com/clients/46590/File/mugebibumapovem.pdf
    • http://salon-urody-bellis.pl/images/file/55547974491.pdf
    • http://carsonpokebar.com/uploads/files/98053863875.pdf
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/xokukokemivadusipavi.pdf
    • https://hutechsolar.com/upload/user_upload/files/28318733351.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1d6dfba4---73528430264.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/31070668931.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01e.bin
e674664a4b936040a4533014f7e11dfcd23fa44ac9be96ab731c58e6ed463d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 17992 bytes
font_01_sfnt_off00010ecf.bin
cfd1f048a75612ede34921cf60b6af0dcb9be878343494ffad48297eb135ac5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10444 bytes
font_02_sfnt_off0001265e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 16792 bytes

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