Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e03da2a2a5d2915…

MALICIOUS

PDF

77.3 KB Created: 2021-07-24 15:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2327796cf5348b48e784b6b0bba4b0a6 SHA-1: 642c168b80f4e4406a1712333d43cd9bb795d3d7 SHA-256: 5e03da2a2a5d2915ecb3baefde1f7a1fa734b0cc362ae20f339a740d4dc71be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cokhiminhhien.com/media/ftp/file/dodoridenij.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a9b513819---miwumabununipegoxif.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vewunamaxadalo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ebe792f155d9b9e5b6f6e072cd49cbc6/mibutugiwobojuxukakudamof.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607822197f7c5---gonan.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f85c74ede25c0bc8fdce405654db4e19/manusolupomirojixodawive.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/tilijaris.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8056759a---12649214937.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/58102542533.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nanifugasaxiboberip.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/teretilupuvotenuru.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/sipulegexujejarozu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/46940557212.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/raxakekilo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ea5c326697b4ea30a2d372ceed64a6b7/valepumusadajodikotok.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/97112971657.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed2948fa0a73cf5c5f42bd57edc8a5a4/46304354282.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/genesapasiloturodufukur.pdfIn PDF document text
    • http://jar-ted.pl/file/ligenazuxivegulokumelib.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7d701f1ca1676fd7fa38254321946a5/megawubelebexefofa.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/sunuxuvaxevuwibusesinod.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0ib0f47hfn6g2p3bq3v7lil5pa/rejufimotevajelipibuvobaj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0c34cb7b712a86c1a87bcc18bc84ebfa/bazenona.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/98663321459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=staples+mailmate+m7+manualPDF 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_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 10420 bytes
SHA-256: aa92a7f80a8451ab55183dba3d8b9a42c346753725eab37cfd55c74a3f54c3b9
font_01_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 17220 bytes
SHA-256: 1c94c5f3ff4f890b679aa0db7f4c3e584ba8c081422cde3ca5fed320fca53c39
font_02_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1