Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a79b447cb366096…

MALICIOUS

PDF

72.2 KB Created: 2021-07-01 23:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2a74ffb12695555202773e02f2969119 SHA-1: 0bb0c244cd5fd3ef5dbfb5b68fdf97badb85a7a1 SHA-256: 5a79b447cb366096707bfb8d4f561cdf145706b481e69fcf2703832ab0abc1f2
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/gl0gc056ol18281kiqevouqes5/dasamafadowebukeronog.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/jkl358mic4cfrqr0pu4s62o734/vinaxagotowejosozali.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462bb2c59c---danezite.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1623322805.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/99416691029.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9grpb6tmlarev1625d38ge2itp/49673811289.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/lilibivikasanud.pdfIn PDF document text
    • https://capecoralliving.com/media/file/jekavapapitibumodivizuw.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/rejoxovokaxa.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae2957ff0c---bowiriziv.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/jagonifivepevav.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5b2a2cdd373172943e6871b06836f6a9/gesubaw.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f3lr6hjmruougqud2gf8cb0oj/74516249336.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/540352839.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b705f87862---zisopugakasa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3076248863750a67d1d037fc9c0e76df/puxaranexirawidavat.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b23a7cc470ef2b4b975950192dce45d3/24105264693.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hugeh3ti5p7d29hh0ls2593ve0/13611576591.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/78088387920.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/87814839070.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/wubefunusibixusut.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/uqi1um8o0nlg4adnte3q49167q/vovatojetutuzipilofegujaz.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16086130570bcb---14540319669.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/36661968598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=explain+packet+switching+with+diagramPDF 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_off0000bb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB87 15108 bytes
SHA-256: f0649b1da172b516110dc7548e3a6d44d0b2e7e35d8608a6e965e0001ae9562f
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 11104 bytes
SHA-256: 3370adcd8fd9578c65007d904e89beb91af39ead94378362ed84a508d1bc5e2f
font_02_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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