Malicious PDF — malware analysis report

Static analysis result for SHA-256 243447cfba5ae8fd…

MALICIOUS

PDF

88.3 KB Created: 2021-07-25 12:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17410d2b97a465945db316afdcff9a8e SHA-1: 5033e51c142324e4c9a4171849b0a169bdd48e2b SHA-256: 243447cfba5ae8fd84a4a702487dca03c6860f0d888e7bccb7d1baaf80f13bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

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://ags-car.com/upload/files/dovukakidaxavelibiwefefag.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badd0e07d91---fivude.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210704_8237595A8AD8973A.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/kebor.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1453547b---nugawudegitorakitofivozel.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956943aa2cd---ruresopimuk.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f725feaa---livipepebovilafuku.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/540501f02c154140b66a6d2b5bc7c00b/71896915719.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/42781400935.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/dinoguxarux.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/fejanagapomanolejigirikel.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/1b9e9dcef55ea8748fe3eaff7aa60e59/75877052427.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/66007589165.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/fiwajugitubukirijo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fcc01c31d0961dc16b53226b68bad87b/lomojeledirovaju.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/neravixetemufixopuzet.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/12564753014.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ac77151c9---51501003521.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbcc33f651---biluzeko.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/foxafilujorel.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084eeb38b092---93810644897.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/29695631662.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/gevatilojoxedawu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/95013118867.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/48507859881.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/fesepufabavokulebol.pdfIn PDF document text
    • http://goref.ru/files/file/sadetejebiwotere.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c2fd44cf---1806660500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=does+baking+powder+draw+out+splintersPDF 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_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 16576 bytes
SHA-256: 9949ec0be52d45b563029dcbb18255db9d750a260b42ed4cbafb281343e51e99
font_01_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 10984 bytes
SHA-256: 8f42f24352192e8762e3d3b8892de2293f357c584f8e39fb27d825f3871c476c
font_02_sfnt_off00013b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1