Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fcc73de574fb0f…

MALICIOUS

PDF

81.7 KB Created: 2021-08-29 07:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b04addacbdc5babcdde46c03c94fde0 SHA-1: 148f39f0ff88ccb85bfbfd64d615f6995b06e92c SHA-256: 79fcc73de574fb0f231f3f413df57dd8b5be278d51f6cf7e167b910ecf26b42a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The PDF's structure and the presence of external links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=complaints+meaning+in+malayalam PDF link annotation
    • https://fontaine-eva.fr/userfiles/files/99481867026.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c4df2d620---tuvapukolijepiwukudiv.pdfIn PDF document text
    • http://moristas.com/userfiles/files/82450845460.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gesotuwabib.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210605_090356.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba16f3cc2---mewowubatiri.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ed28c72b---9978245027.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/78131603850.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521055443969586.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0bf88019958895f044a635f1c1a210a2/17983037258.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/65488142832.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dp6iov0aladkj9jps5tu8h1gaf/bikoletafezala.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/67823670868.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/57694710328.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba81d253f---72745776685.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/6568495320.pdfIn PDF document text
    • http://www.centralperdana.com/file/16889232053.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/65960666235.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/letefofupimigakilikilutor.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe59e37514e---wozigelepetuvopala.pdfIn PDF document text
    • https://zzwgjx.com/d/files/9176246728.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/22713692629.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcbf7bc9e---xukig.pdfIn PDF document text
    • 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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10640 bytes
SHA-256: 41dc3a9a83b84d7b2f437cb3f7218f57a2a7ae8b2e3ea17b3eed0b0c7019806a
font_02_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 22464 bytes
SHA-256: 49d9403b31644b0bace9bac68e58e1e357b15bed612644615b09035f457351d9

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