Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9ea0bf637ba43…

MALICIOUS

PDF

77.6 KB Created: 2021-07-06 21:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2254cf170542411aed58ac0fab798ecb SHA-1: c1e5004cfa92947e8736ee1dca28b77264fe135c SHA-256: 79c9ea0bf637ba434ba5b6a5278504f2970bf10472cc5fadff990bd4d87481b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of these links indicates an attack pattern focused on directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081caff66368---keviviverijilif.pdf In PDF document text
    • http://logistra.fr/ressource/site-image/files/52246235592.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7fb0815c7---sanisabimumi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8elrk5v359mcqavsrca44gk5g1/bexoxipaxuzofat.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f6815249---muzaloxevazawa.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/bugigelezo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h8iuvu6m0h0snv1tphmi2jeb51/derawewajuv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076883f3ffbb---39427884741.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/noraxijanedipewi.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/tepitewezatogidasegib.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a596220d5da---zazufagexitudavubasi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608174f0e6849---14186287641.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5801b0d4d398c245879cccc1017c7e63/xetiwililubugo.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/95023bb272c871d49cdcc80cedbfcdca/16504346300.pdfIn PDF document text
    • https://latework.cz/soubory/69726480652.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/51927607005.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/86662302614.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/53280788100.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/882992c6c9161bdca497b826aefac676/pavobaziduga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea9c55ea32---vufuguxu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160906a6113983---99624642125.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceca81600f---bixutoxifepuvo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/voxudilomerewoden.pdfIn PDF document text
    • http://alltechsro.cz/files/janel.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4d46eda4fe200e3eb150385c0d170f9a/xadoziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=romberg+integration+examplePDF 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_off0000c8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 17684 bytes
SHA-256: 72bc4f57d994d5bf9dc8dad103244a026fec99f4fedadf7335eb8d576e2e9ec8
font_02_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 10716 bytes
SHA-256: 136a7ef63a0559101077716d05f87162dfd6056eb5bff56e21bb279ef93444b1