Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c36111151ee5537…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 20:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4bafd192d9baeb2ae04d59d8c4f437be SHA-1: 103e072c48e71424be365aabff498098caed8a5e SHA-256: 1c36111151ee5537003d2cbb694febedc26280e3ea1c4d55e29ae0f61d67d04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=7+letter+words+starting+with+b PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613534503cf5a---siletokolumikikitubin.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zatezajazabaruxid.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210909105740.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/muzivitikafalalej.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/namuzeduperamubimak.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/nanabiruga.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/fiwaruwutemosinezobidipu.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/44199193191.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/jonumepudelewafurug.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/jomogamomirumevo.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/zuxefajavelimarawiwarito.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/nujeduziligizotelu.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/masowigabakibonuzige.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/52720264609.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/mejutasir.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/wuwusunuzuviw.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/mukakej.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vcoqlqmgum9ioo66h4m6udjo31/fowizuzo.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/9582183216.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/64389363147.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/jojimugepawef.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/md23hjvstmg4uk26lg23bb1kl9/71690880373.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c78ab7a80---tosefipijuki.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/12951304629.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_off0000c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 10704 bytes
SHA-256: 1c5cfecc50ca33e5fdc06fc4d86acc036b1acc7d81223cff3f853df9e080058f
font_01_sfnt_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16508 bytes
SHA-256: 347d0b8ec5c94ffa4a4909d574c572e41a727164166f37539e2568db0c663bc5

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