Malicious PDF — malware analysis report

Static analysis result for SHA-256 1083194560531064…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 15:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f6e7e557f06f132a7ce6e1a9b0fdaa8 SHA-1: cd0c1f3b7c6547da6ca1236d08c331eef78ded5d SHA-256: 108319456053106404e9f13c3efc5ef171f9fd5857879e14b915834feb79a617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=streaming+a+quiet+place+part+2+full+movie+video PDF link annotation
    • http://slsnn.ru/content/files/laledikokaxedupinedosasam.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fj3timoofk2jm0gs107jl8gqgr/89673666291.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/nebudobinusojuvubiwixep.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/58224546726.pdfIn PDF document text
    • http://gr-chem.com/upload/files/54006216879.pdfIn PDF document text
    • http://stringladies.cz/userfiles/17254207601.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/32119064978.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/84779857699.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132193571d5d---27545474811.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/63001989138.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/60846462133.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/tatunuwogudugelelutatu.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/xapafefogenogibaz.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/64419650704.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/75414608254.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/pifonoxok.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/38565771643.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9f3d8b79652cc11b3bb19f4036bac4ae/loguxu.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/wegokavevamokedizak.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/909130563.pdfIn PDF document text
    • http://babamoleskine.com/files/file/88505737834.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/43524760633.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/wuwopevisidenene.pdfIn PDF document text
    • http://leguido.net/files/31626484094.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kunekapu.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/vupexubebu.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_off0000be01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE01 11300 bytes
SHA-256: 1acf547aac8d7d17bd1000e700a0fe4469e6b1a6c0047bbc3442b671d3ff6f7b
font_01_sfnt_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16696 bytes
SHA-256: 9eb568bb5f79f36325c8c42b247acfcaea64aab1b546ffaf586d96b9d824d78d
font_02_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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