Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7386e1f21e4ec09…

MALICIOUS

PDF

76.5 KB Created: 2021-09-11 18:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 421a66c93230c585e1f23229def4ae3f SHA-1: c1939a67c39de44fee78dfd00911386cd56b8530 SHA-256: b7386e1f21e4ec09160df1fcaa27aee31bb8e2853dd2bf597df43320c8996c30
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The PDF itself is structured as a link farm, aiming to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.la-providence-ehpad.fr/ckfinder/userfiles/files/todizi.pdf In PDF document text
    • http://healhumanity.foundation/userfiles/file/tilul.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/kabarebiz.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/xevepob.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/48067266938.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/welesajivu.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/45612004.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/bejavewupara.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/3204218090.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/9d717e15a370f07a1c2e130c4ca95d0b/nugodifaputebipadajavi.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/81258521161.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/55493334653.pdfIn PDF document text
    • http://slsnn.ru/content/files/vuzebosuxotarebukan.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/33430491062.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i4m3kgcbr4lhsltl429dpsgae5/18049423132.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/93225791107.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/bikogubujogafoxonet.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161325d8492090---93520947983.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/pepulexe.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/kemojufowebupuze.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/11555072724.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/lisagokazitovifiluju.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/14371769972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=can+you+view+private+instagram+profilesPDF 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_off0000c393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC393 11100 bytes
SHA-256: 1e28e85f1aa368781972dda165b56bceee32ac2457d765c3430ba3f6a26dc71d
font_01_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 17772 bytes
SHA-256: 8e13a380addf2c8e4ae2924af3a48a4d68276d616c81e1cca786e3379e2624bd
font_02_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1