Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5faaf6b6e25e52…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 13:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12047410c796d72ec63769ea05629d87 SHA-1: 0c6e0f84f6e13111d35a9b908a92af1364559ddd SHA-256: 0f5faaf6b6e25e5273351749ff11db297bc6f4500441c9d64118b848ff1be990
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple links on disposable hosting and the use of UTM parameters further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdee0b92b0---jukiwalijamariv.pdf In PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210714_109ABD53E7718E89.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/putoxomavuxa.pdfIn PDF document text
    • http://taxfreepoint.com/file/fiwodixesuta.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/fofunagoloturupesojipabis.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/mibumisonojalivinixo.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/70142830550.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f8a0d62f---favivepajiwepupefig.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/gurigokimivadavezusup.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4v3dg3na23gp1vdfvoh7bc2tl4/jemuligijit.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0d1aed605---pamatuxutaxo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wutedagediz.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8c2ac5c9d08a6a07f69513ce37847336/46648453984.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/64492453565.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/vavilopasi.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/54894192173.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/7858335709.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe7d735e38b007837f0975b3b5a253cc/xifufurit.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/897e801b0add7052a33423af9dbb5a81/kedudutesiximizufikaj.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/66682754786.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/punabozonorotujufofabunir.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e3d4bc2f---bidosadikimiviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adjectives+with+prepositions+list+in+english+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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 11000 bytes
SHA-256: 37819751f4c9b5ec0ddd710b43f07c828f99ff039c50f13d4b26df6156f8e935
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 17252 bytes
SHA-256: 0ded03360d88e3f5a04ad4e47c422de8add1baa244d0e347b04ae771d81cbeef
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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