Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a365455e1307d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 19:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5f12e3ceea0d6e5729734aea837790b SHA-1: 296b91daa811dc25ac2eaded0a7367fbedfe2d19 SHA-256: 3c8a365455e1307db20ff603105d4b0039983c03f7ff77709a83d4558aa93982
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which host further PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e8964329550b63b06a7cceddd43b9eca/fumalizepo.pdf In PDF document text
    • https://topupdana.com/contents//files/finatuvaliw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5b8736bc4---wufumewinumasa.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/1657ae8dd5581f77892e558795172754/vapevivudavikevezud.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/78376436448.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/xenopaseralokak.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/lijesunofamerube.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/bivozikivewewafomisot.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/bitegamowena.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/dazizuvinubejekajejemo.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/vujatefubofalaz.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/31037784338.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/76583055210.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6c032933fc02cd8a1af19262c5f6eec3/gekadigarebefonepasumil.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/69492608762.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a99d0997---75904476534.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9158143f01---roxolidupizazogadusigaf.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5959105fe56c5c481df0281beeba4861/fiboginenipav.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/58057252482.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/ketupanixasogisawiduba.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/juwosaregizakemutowef.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/poberewupagap.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7cb4271f1---jifexazebubidog.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/52239686835.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/wejuxawodidiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=workshop+lab+manualPDF 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_off0000c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 10520 bytes
SHA-256: 1b0a9ca9a4a7c4320d68d7a39012f8670aef09674c61ba0a99013fb7924e0b7f
font_02_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 16748 bytes
SHA-256: 7cbe9a3e5ad0169ef7cd68b6197c581c19b80f5b2e1c8ecae978ba7ce49569d9

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