Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbbac3a70df3938…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 19:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2bf13c0007e7a4f75829bbe4154101ab SHA-1: 2747fe79b98641a49a5d641e28e063e2aca48637 SHA-256: 7dbbac3a70df393817c50b6bc42512a519c3a73dcd82d5b71ffe057486dacde5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites, which is a common tactic for phishing or distributing further malware. The presence of multiple distinct hosts and the use of compromised CMS upload storage suggest an effort to obscure the true destination and leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://expobar.vn/app/webroot/files/images/pages/files/47720550919.pdf In PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/79105464410.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/roxivuxazuso.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9a483a755744501f7d59400e138778e6/45248914195.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/xilin.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8t0jeseah623lnmd2eknspubco/79754959135.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/mewobizidoza.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ubp5c7fuo6aolptu63p5a1dme9/kowuwipujuropabonagabix.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/72240007456.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/gubedukebofemebamivinera.pdfIn PDF document text
    • http://mav-auto.ru/images/file/36177762287.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/mupimigiso.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/49890713498.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607587edcddeb---24282790811.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/19110658327.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ce921fa96893b44fa90b375c5829019a/vuwobove.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fc0268b7757fff4bd4ca9bbfec9e3a63/dewesefuzovamolajamuv.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/88206240497.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/45377139898.pdfIn PDF document text
    • http://marymo.ru/uploads/files/rodov.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/pupafemimemosumuf.pdfIn PDF document text
    • http://www.bash.cl/media/file/98536253205.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4d5cafc0---nakezonigomigoga.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4f3cj9lsv22ohrl7v32dch0ks6/wasewifoxaxonugoxonadam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ryobi+18v+chainsaw+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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 10976 bytes
SHA-256: 63608c806410304e44865d8d7df8596eb8e9b554c309f12dedeabebb3e785988
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 17380 bytes
SHA-256: 810b64acb78733e5cbb71a18e243cf12125c63fc8a63a5a9f2fbb2d9209967a0

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