Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd010bb923ef37d…

MALICIOUS

PDF

121.0 KB Created: 2021-07-05 00:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cfcfe685bb0463bd5e29f3856eb9f74d SHA-1: f1cda39bd671cb25b023d93ceadb4d09de77fb6a SHA-256: fbd010bb923ef37d35da211e2e37590756490fa8568027347d72fa35e705189c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=derive+an+expression+for+the+kinetic+energy+of+a+rigid+body+rotating+about+an+axis PDF link annotation
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/abdf5912b2adca22a44aa1da89dff0a4/13368342384.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/snpn7k4o9ri7nbhd9qu569in45/tadevaxofigobok.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c267068bd---92044300875.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5ed7c70065e15ad84e7cb2691b61287c/vikewokejil.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/vudabin.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3650caa12a---wolozepet.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/fupejere.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cb136314804---lozajukobi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc8e33b04---bumawirojopiz.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/54464daac0fba3b7ca702f21bfa0ce62/78330869622.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/24598043161.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/vuvusoxe.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607618911cb50---81902402235.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad805d9ea4b.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/i3620ql9k19qauiuqn3ik7o7cp/zinevolusa.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe23ee45e---bemuf.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/22525477920.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/54486858065.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/l8tkrle3605d1sp0kk95s63m41/58453406964.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/xumud.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/pumili.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fee8db43b---tidorakevav.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001559a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559A 16144 bytes
SHA-256: 1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691
font_01_sfnt_off00016af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001830d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830D 11468 bytes
SHA-256: 42d0d0d46ac0bb3407f1c3d129aedf8d2fbbb39fa4925d0d34ef9efbc3326e26
font_03_sfnt_off00019dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DC6 19760 bytes
SHA-256: 69cec7a5edbcc2eaab0548ef03ae2c37fcc1b8732e574dda25a3ecd7f050744f

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