Malicious PDF — malware analysis report

Static analysis result for SHA-256 1083aade2b05354b…

MALICIOUS

PDF

90.0 KB Created: 2021-09-04 14:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c6342392b068b0c251392da9085e8c8 SHA-1: e0287cc910b738b519bc431ef7c7f844414b5108 SHA-256: 1083aade2b05354bb02f332f2a9f55b76d12cf73d21ac8fb9791ecb399751b6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a link farm designed to trick users into downloading malicious files. The presence of embedded URLs and the 'Download Button' heuristic further support this attack pattern. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://apothepharma.com/upload/files/nekekunukawitoxos.pdf In PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/95400948516.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2e67559154752f2a5202c567163cbced/5662145991.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118181273ecf---dawodilikuxuriwapuviz.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5ea28ce2a7683f31abd98dbc8a9f25ce/banemotu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609557a670ce3---91770407593.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/wakanam.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/8300219616.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b9bc9856d74e0b31cdee7105c99def51/47765419278.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2a077b9f---64629092394.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/94082387725.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4988bc9a29---wafonobixabimi.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/7417648761.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hb5rdt3rr88u0kaaulaskjiq43/tebowilukadodurovex.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ctrphcj8ts5ss5ltvr1b394jut/99773866360.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/12166318797.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8u1mp20s1nc58ch7p5o422f37c/12109621567.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a28cc32cb54---xuwilamupamedimakuse.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/40902846813.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/42381442961.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/48477233297.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/11461758010.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/90289912063.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43210d2e81---62210622267.pdfIn PDF document text
    • http://www.bandungmesin.com/file/bolerinud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ielts+writing+academic+answer+sheet+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001111e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1111E 18032 bytes
SHA-256: 0e5fb7c4f8172cab1601ae5ad6909059adcbee4d667319cc8ead228b68cd2885
font_00_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10984 bytes
SHA-256: 268ea7fba28b499891bbf9adfd91d9d482c05a5142dc7524308deb0a986ef147
font_01_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D64 17008 bytes
SHA-256: 713795d55fd5b266f7bbdf279ab82b886b3dae97fd03f10577d3f40448e4aaa9

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