Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e97b9370b9cda05…

MALICIOUS

PDF

70.9 KB Created: 2021-09-02 21:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dba9a75a2519c89ec0b3b916cdb1fc0a SHA-1: 130b025b17ae061917e3a110ced670a60c07f1be SHA-256: 3e97b9370b9cda05b5786058eadf11d9e8feae5230f1e6c10dda3a6378d1dadc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=gktoday+march+2019+pdf+free+download PDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609919ff5068c---92818822262.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/luzijenaturak.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8p9c5h88hrpm2soli4c4dv9q71/tedodenonapatagunizidowol.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095a206a3577---xafarojatekirugikuzenab.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d471a2f838---54749916957.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/biwipin.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lezapikuxibamajobuk.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/28564131071.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/def7270cf2330db35af30da905ab80a1/setida.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160860196ecb75---69107920081.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/nufunojesab.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5a8d24508eda72a50a041cedc3edd1aa/45741925071.pdfIn PDF document text
    • http://amandamaitland.com/images/file/50220354786.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd28c3f2ce---1793164050.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0ktuaucocrb7nftmt3mso9m5qc/99506170031.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbc73efd1---60215460108.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/40854885722.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/mabefube.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/0ce1dfd95f6d0a79013b59c3e2852e04/42613000169.pdfIn PDF document text
    • https://limsurempat.com/contents//files/53579024080.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/gibewinidisana.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_off0000b370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 15188 bytes
SHA-256: 6557dfe7119ce53eb0f0e61d16371e92c21335d6dd24ef6e325386df0f587d07
font_01_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 11416 bytes
SHA-256: f8afefc126332aa24cefd3a13f189743d9e2b49849b888ee97d9b5ac3979bf9a
font_02_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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