Malicious PDF — malware analysis report

Static analysis result for SHA-256 035e3882dfb3ab6b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 20:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9de3644ad727f4f1b1df05aa58a2894a SHA-1: 9b567a641bdefbf3b699b4c6e463e8208090ae3d SHA-256: 035e3882dfb3ab6b532eb60efb8e94c8a4013df36d3b3265c1c873308ea2094b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=winning+eleven+2012+on+play+store PDF link annotation
    • http://sibinetweek.ru/userfiles/file/37857727767.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/pebibeno.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/lojujaduvaxef.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/muwolimixugulu.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/25381949245.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/50421199025.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/88496759249.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/pumopelurajizudaxod.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/75691155498.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/89202679432.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/gedomubiki.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/42b3a1884f8044fc004c17b3108766a0/fonidibilakidelepe.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcdb8fe9b---getezebib.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/31206426976.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210914044326.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/70244050674.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/jojineja.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/viwadegataga.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/37615358937.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161324c6674d5c---dadigukuzovuxabojevozo.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/zibiwuv.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/kujexuligibusorululova.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pubimoxulitako.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/fulom.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/bojunibomo.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_off0000b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 16508 bytes
SHA-256: 8f74b5e52ea5ddd44808e44ac287349e3037cc7ab9a9ce5e8cf8af050415b975
font_02_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10892 bytes
SHA-256: 469e19181741c7f544a5ba2608bf409e85d4c8d668d8ba296c6a38d286cb3213

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