Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b4e5957bcc73e5…

MALICIOUS

PDF

80.1 KB Created: 2021-07-29 18:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb4421e65c93650f9c313e97ec4e64f7 SHA-1: b04c503b67cfa40e99f9bea8aea0dc448615d36c SHA-256: 71b4e5957bcc73e519a908ece89e867d0fa2fb31cee8d240d5f71950c13d94b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. The heuristics indicate that the PDF is part of a link farm, with many links pointing to compromised WordPress sites and disposable hosting. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious or phishing content, likely as part of a phishing campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=adjektivdeklination+bestimmter+artikel+arbeitsblatt PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7260d94f8b---megibuz.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/26316518187.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/22035799607.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2nubo43hkgkul78ttbe93d2l85/10486665121.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/86893117623.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/jozupokemosof.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e275531fc8018b688f5e074a05e46db/suvalusaxuselasameg.pdfIn PDF document text
    • https://scalper.ir/data/files/file/60289278229.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/66689077554.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/dozatowibalu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160858199b1d38---jejuvozagidis.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/21abe3ff1950b976cd77349ef01aee04/64014015102.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/53801440918.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lfg2aahgmql98r8d5o6hmg1uk7/perofaximuturababi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a64f378cda9a360ba2374abd03955ab7/2565340845.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/18822475770.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/76730828133.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608294d860f79---semobategogex.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d927d4452c3---patiri.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1aab6f67e---33018113501.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/xepowux.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/65278163056.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5a4a2df46aa2573370b8791ea4722811/98062721234.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427b7e2873---jedikaz.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f3bd2561---6142154854.pdfIn PDF document text
    • 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_off0000d111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 10820 bytes
SHA-256: b6f35779e5f8822dabfcb3e87135838387cdb9cf73a82a235f618340a2b17ae2
font_01_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 18324 bytes
SHA-256: 6116f367be2347598a6ed10392b95be10c2efb4bdd3b95f1016bd1c3b438eb37
font_02_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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