Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb377277e2745bd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 14:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aebe0231aa91a42701a4d9f1dad7d301 SHA-1: 9800548258da6b43ba3c848038b7900464c156b6 SHA-256: fcb377277e2745bdeed91657c1d1168fe64763a0231b443efdd69b68a242464a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which are hosted on compromised CMS upload storage or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://synerhu.ru/uplcv?utm_term=henry+stickman+escape+the+airship PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415a9f0dba6---fumibunefisutitigofevide.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/ledarulutevetote.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/3905459811.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/zikalijudun.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/diperanotezatezaxuwekesug.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/40585126657.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/puwoj.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/vudavowokeramomolamil.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/95912431385.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613630c32aea0---89474096499.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/19287950505.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/33150236073.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/tokinumekelewomakenej.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/55010756740.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/4957505591.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/76957296702.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/29072024491.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/13580092885.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/67024232765.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/09/gepafewijusin.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2a326bb0a2032e6186d073da715e2d8d/14010424231.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/xidufebakijazevade.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/kumorotobuxibagof.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/98779453263.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pezulavenutaxoligajenirun.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/xovuxefonaparisuxonuwo.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/dogosari.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/86194055459.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_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 19204 bytes
SHA-256: 155c3eb493c524920432429e4ebb90d0d6194b0e5e0ae8dff6a5a0c53c6cf08f
font_02_sfnt_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 10672 bytes
SHA-256: 9856ae289aae29e31a4148ac4d88d3d6a91632eddc75e41fe67d74c2d8427c9d

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