Malicious PDF — malware analysis report

Static analysis result for SHA-256 7440ad79cd09f40e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 09:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 006296d53d70072b9135bd009fc6871d SHA-1: 9d7a2e05dbd7b71d3cffc257fdb93af6b8246710 SHA-256: 7440ad79cd09f40eabee883781980d6cee0848cdbc1e34bf45253688fc6e8a78
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted for containing duplicate objects, which can sometimes be used to obscure malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://grafconsulting.pl/Upload/file/logixanujiwo.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160786bd797db8---62498732558.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/kewuzosetarurapi.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/c9852dc67009c2046db527670b42916d/wuvanesow.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/molufanin.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeb3f2ffb7---24435737151.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210601123323.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/toq55g8g3jlln8kbdolfufobv9/82187020247.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/fulirinunerum.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/221164279.pdfIn PDF document text
    • http://shesob.com/file/files/bajijupugugodasapipivap.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59f7e6369---73185282584.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/b63btcbpg9sunpf8c2rim6iprv/12753447060.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8m58l9ev7olu2nh4vdcm8grct0/sovumu.pdfIn PDF document text
    • http://innotack.com/userfiles/file/basibemiwitefofomid.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/ruruvivigibafizewuxabebas.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608748e6d84c6---27857828810.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9e5024fda10dd3f33e3648f67089aeef/jijatevutizozukunukotepes.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/80669816506.pdfIn PDF document text
    • https://salonrewards.ca/images/file/ruzilegodejalitekukupit.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9fb8fe84d7b732c8a4fc1131c7e91ecd/68228968641.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c652acc1e4d725cd115029cbf5bd712e/43845367565.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/vodagivevepetodejomabe.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/vejegodezifol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=human+rights+political+science+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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 11160 bytes
SHA-256: 92cb26a4275a57a168a2f1638cd0a41f18c6d6541ee72d33b0d9746cfe358034
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 17412 bytes
SHA-256: 3ea962bf596c2c29342b725e4003e3922d21db01522ca9841092e64b28b1e074