Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ccc4c6ea0e97ab…

MALICIOUS

PDF

92.8 KB Created: 2021-07-25 06:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a4c7e171d2bad6defddc65a4e6a8d5b2 SHA-1: e113b18e98fa4b240578336f5a3679a40733e436 SHA-256: 27ccc4c6ea0e97ab8a92e066576b67e115e25d6f67626ac7c0da587cde09e5e7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the heuristics strongly suggest a malicious intent related to external resource access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://aviatroglo.fr/IMG/file/xodunudegigerisumep.pdf In PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/61470235319.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfec0db05d---86994007918.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/13187611377.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/wasajas.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b64d043c---raxefexagebusajepugepujo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/alemif7p3495fl3gdjesdtine1/sunixuwuvubekafigolupon.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210713155826375861.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d9454ac9244---55612612360.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e09b0485ad1951810a75f7bdfbf30998/78800156317.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/jitirijemu.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210605101353_360272391.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c12819c5c52---dufibojujelujumadopa.pdfIn PDF document text
    • http://mcutech.net/files/vusenerokumasovosotumegu.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/80712834622.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/6324577b90ed8f5e630f85ed65d7b4ea/jepimovudibaj.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/xijefoluwatimi.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/27132374704.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/rederuvibuvutazaginujunid.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/65991462107.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/89befe9c60d6f8b38ccc7ed5dda53c00/vikopezilofexesumexa.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/vanatigeratolu.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/lerawup.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/84490621322.pdfIn PDF document text
    • http://beta-rc.com/upload/files/noxerolilorigeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+create+a+fillable+pdf+from+excel+for+freePDF 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_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 10828 bytes
SHA-256: a3c3bae34aeb9127050c3c3be6929bd8e88718dab1c52b38d7b5786f48472927
font_01_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 17156 bytes
SHA-256: 00035b9267cc1dc29e1992108578a46c31c4e242a39cb66b236f474ddcabbb83