Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56e626435a4045b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 22:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45cf42b4b5f9643e48da811e02d827c5 SHA-1: 90126c00734df24cda73855f95fe203dbb9765c8 SHA-256: c56e626435a4045b557174343b703f8bf75de68ecc692bf61949bf6c5712fdf8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS upload directories or appear to be on disposable domains, indicating a likely attempt to lure users to malicious content or phishing pages.

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 http://www.chatanakonci.cz/userfiles/file/simetupukidesimodo.pdf In PDF document text
    • https://vpmemorial.net/images/file/66978086941.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/19224060834.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/23882320493.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/34561810362.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/jefanupowep.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/rubixidokorigoriraga.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gaehtkqcd4fs6k8dug6idl9d85/nozazigemekomusukosazubi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/nomubopifoxizew.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/47790065334.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/98392059028.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wovibisij.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/54087119351.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc1f16a06---rakaxamikilituwurimabiju.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/84593886011.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6597f022d3---tenizaxijaxese.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/pimanujugasexoxamudogufa.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a73cda82cdabd1b9a3da27b301fcb5b5/mafasurifarutanezibaf.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46ab9e2aa---39438551681.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/72c1ac4f4c6a1153fca96530acbfe226/menovutifo.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/g437n3ef7nu2e0dmv43c7lgpa0/rumatepoxon.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/074d5fe3bfjmbbvmtct9naqq63/rokufodatutaliku.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/bugilirujebelizexoremas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bank+newsletter+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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10508 bytes
SHA-256: 565a962b4ebd2d5d422a17e041731ac8c21d88d277b29a83473e67ff2496945e
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 18552 bytes
SHA-256: d82c6697d7b2de7ff48dbe7cc164b8406703eb72ea6b40b57f39f6d49d34d7f2
font_02_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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