Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a36d4f9d859c2a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 08:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 219f9e4a6117ac3ce05e86d593186087 SHA-1: 3a2cbfd66b4bf24fce4eaec30003e1849961357c SHA-256: a0a36d4f9d859c2a4aa46c6c98dc8e6dba152b3d0652a8b190b5b509c97f92ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://italvaping.com/file/xibekawijelaxeputugevevuj.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b490c619.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/lokukorudaxegu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc960eec7a6---22761276145.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d336308d5948d32cdf8d6b5adcbcc9ec/verifi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/11392848806.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210803014304.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lp4igaue5rojkakvu7132qim5b/wavoxojikivusugijozi.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/32509604229.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d85b1fb5---91685719639.pdfIn PDF document text
    • https://koratspring.com/upload/file/xuxeso.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/lakasaj.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d193896e---xifadim.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/zobin.pdfIn PDF document text
    • http://domario.ru/userfiles/file/41642978014.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/mezipuvaluwakolilux.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/nemojatikogit.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/jiduziluvedowegedonumipep.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/94v4d9p9u16o6oifkrjj1sirts/23396146956.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/lusogipefuze.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/7578239886.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/difimus.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/rigejudorunajixaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=essential+elements+tenor+saxophone+book+2+pdfPDF 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_off0000bb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 17744 bytes
SHA-256: ab9eaa95ab1df5a02c62763d6e21956df3f9c66b03ee07986f32e766b1cbdc0b
font_02_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 11200 bytes
SHA-256: 5dbbcca7cf41917e928c6349a3f2f48f8223e39d3a8e3b46e242d8db58cf56bc

Open this report in the interactive analyzer, or submit your own file for analysis.