Malicious PDF — malware analysis report

Static analysis result for SHA-256 044a16def21520b7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-11 22:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70de1d836b6c4281a52a5144d7fba3ae SHA-1: 563e2f09e2c38398f13acf104b556842fe67d0d3 SHA-256: 044a16def21520b7e5036be47ed49c748aa963ef12ad5a5f34c516abf5461701
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a malicious phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to direct users to malicious content. The presence of these links and the malware detection strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vinasimex.com/uploads/file/70219919800.pdf In PDF document text
    • https://fwstc.in/userfiles/file/jixazetonudivolojaza.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f7f88da8a130df423289ec2f6e9dc071/89579191824.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/2048278731.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/samolinasepepagiren.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/dawazewotinobu.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-8/20210908000359448830.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/zusekabekilajidi.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/71449147744.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c3b53b6e---84300205824.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/sazalajuj.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/67709565953.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/39588251913.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/vutikudos.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/62028150649.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/lagosa.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/rivivewulezag.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/63433216262.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/juwilisiwejopopuponumexok.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/dilunapegupizo.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/5311789975.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161322d76b23ac---vamoxinonul.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/284145402.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4c595379785f3d892cc71111efe09bae/42984197850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+send+photos+from+laptop+to+android+phonePDF 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_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 10840 bytes
SHA-256: b67ce86f1fe08d5ac0866ef23f0797252f46b733a38a5ce9dde9fe4a49219746
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 17380 bytes
SHA-256: b9ca1ecc05161adf902e3425a6eed308c168c197a8a06d2b6b7da4e78a4578d3