Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab28febb86749330…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 23:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36cb4c03b2dfcce1b9e8be32224b308b SHA-1: eab1cf8ad0eff6f850b5b7ce49931ff21f0c6a72 SHA-256: ab28febb86749330c963c8f30092b4993f5b7b630064100ba54daaa78d61d178
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress upload directories or on domains that appear to be disposable, suggesting an intent to distribute malicious content or conduct phishing operations.

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 http://krzeptowski.pl/file/39117838584.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087409539e7f---2780753912.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/fozujifojetetowozeja.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/jakumam.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/xukadawematalitakobazaba.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/papon.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/61339004782.pdfIn PDF document text
    • https://mfdesign.hu/files/file/14509133386.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efd73c362---vusofolukiwupirimagu.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/8899170014.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/figeg.pdfIn PDF document text
    • http://samtekelektrik.com/files/18699465014.pdfIn PDF document text
    • https://fratellifurloni.it/file/256735671.pdfIn PDF document text
    • https://superchills.com/userfiles/file/penewosinujelig.pdfIn PDF document text
    • https://brs.jo/userfiles/files/jonanurakikej.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01dd08844---29860914851.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/67523700812.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/lidosikixuwu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160770e7e54200---fuwepote.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/xoxugulo.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/84579315849.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gf91im3v5b8r0s7ve3d5a1aapd/24649962343.pdfIn PDF document text
    • http://otczenacts.com/media/files/levenaresupodudebuwimoli.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ampioiqedl3n3u5bd3u2rj6hl7/64879416219.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5ca0e9the5n2eikmojd6pa5mr8/zuwokijuwosiz.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/pojubasobotupefifegi.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/47853528264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=soal+tkb+pendidikan+agama+islam+pdfPDF 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_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 16232 bytes
SHA-256: 7c8bdbff729f7a9bc4710111095b8fb2198accd5e440be8de70966d48ca681b8
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 11048 bytes
SHA-256: b514c0c922e06f5be32f0e29676524ef8d48471ef8998cd2771cb792a5b434ea
font_02_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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