Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cc36c005ea4d4d…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 03:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e633ed0f54fe92911e8d4f90453cfd53 SHA-1: f1f649ccea5515d3e10bbb703cd65a05b043a515 SHA-256: 11cc36c005ea4d4d80b31ed70a008ea3fd2f7a7a417c0ba3ae17842e98352195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

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://irlanc.ru/uplcv?utm_term=single+breasted+meaning
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c0e2735c2db307f4adc5eafc93973b80/dotaravo.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01d49f26ac---16677203600.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hbkjuokpkl3ulneo5sgc7uf9q5/32798359243.pdf
    • http://amdind.com/userfiles/file/mopevivomubab.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dt1tp1ui3svb6p85lkaqq84n52/kudumeveb.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1851611b08---46201367768.pdf
    • http://goteneplast.se/files/images/file/94717362440.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0ba523fe---rebogarilinofununakowut.pdf
    • http://evevoyance.fr/adh/.-/file/kifane.pdf
    • http://auto-spec.ca/fck/file/goxisifofa.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/80438695988.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160920cdcb1fe5---babizeregoto.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5197614ca115c535bc8e8a66651efc8f/41938550582.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f9610ef9e---30825756172.pdf
    • http://ya-ke.cn/admin/upload/wilidetawakegatudipupeji.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebb28ecdb---2623040398.pdf
    • http://hwayinn.com/image/files/20210613_065159.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/64810a8962fef5694b58e9df9817b3aa/genaxegesibapasar.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a066b5a1---24572003649.pdf
    • http://yoron.net/up/files/kosoli.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2c97847afe617076bf0631397a7ea52b/17426634054.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/675b59c21d0502eea4e6119e3f7c1275/xowavugatot.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/68a4b0520d53e790a15a3813700eebf0/50814481755.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608640f2674c9---59876798814.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 16792 bytes
font_01_sfnt_off000109dd.bin
32aa97ac458f80a032bb07abfef12a9bc2f3028999099af148c61c8637d90baf
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 10684 bytes
font_02_sfnt_off00012214.bin
031b63ec80cf65b7e7c3bdedbb199f2234ad37144cc9fe1efde094a2137646e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 17768 bytes