Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f55e34261ed04cf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 00:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad2b54c45af410d4ceebd2749719529e SHA-1: d8f9f1ee328d4a68ae81c5982e72434f941aa154 SHA-256: 7f55e34261ed04cf686ba6481d305b5e2ba69a526bdb054ce0e6f772cf752a0e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms points to a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ardeche.proximeo.com/ckfinder/userfiles/files/vovalameg.pdf In PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/zukusa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c3876067b55cc46c846ff3d3dfdafd07/19549331769.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/jumej.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/61348329929.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kin8mmalcs0ho1rta11q4t82t5/nazujopibegonikabanurari.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/94286244188.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074189019bf8---dufirutugoniwu.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/tegiz.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/2824637024.pdfIn PDF document text
    • http://contelex.it/userfiles/files/nilesawital.pdfIn PDF document text
    • https://sambelteri.com/contents//files/76422410583.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a156141509f---52817183533.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/73703b9aa003940f44e797ed0e76aa16/98970129563.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/36969906257.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e1f2ed02bafff3ed537539042c0b9bfe/basedap.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/73495097340.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/38777601547.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/65229764551.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/63796191250.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d425913d---fewufuzeregukewomezabetar.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/96597847532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=horror+stories+free+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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 18116 bytes
SHA-256: 1a9501551568c7c6bc0b59512d41dbd7a3adb27c2159f9f7806c95df11704d22
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 10568 bytes
SHA-256: 8c58a0aa0a797cdf9d9fecbe72dde32c6f4d3d5d725420fc74dc1a83e9013514
font_02_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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