Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbe3e8f44bc7b02…

MALICIOUS

PDF

93.2 KB Created: 2021-06-30 19:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc8b74e741d89d2a79922377e1288f0c SHA-1: dd4c016aba7eee9da786075c0808bb912f5a35d7 SHA-256: ccbe3e8f44bc7b0205a212cb0b9b7f054f6429708e4fd4aa0b5500e781673185
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2a3a236e---48126802870.pdf In PDF document text
    • http://archerelectricsupply.com/userfiles/file/jugebugezevijezubi.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/49101099840.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f30ae743fd---fofuzuxumomufaxetufo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210618192007.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/wivasogujetafisosu.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/vepewede.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/denofodolumagudemozep.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9df3b1a5b---letupa.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3mci8tso10bt7o43ov0sa2cc7l/pesaduborujijetike.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ca8c34d7c5aaf5961df02979cfa03af9/84598372910.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/enkh8e3og3kjvht3ov01obv3pg/18628097166.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e2cf656ea262791cc077a8d0fb3b7d66/jegowitejir.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/zikibesadasozefolodarasa.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d6d9fbfc5020fdfd0473f744b5fa885f/14218602917.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b611d193a40d03ec2b32ae0f1c49512c/vofizalokoxejukimi.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/nufiruzokukisolupizalo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607498a529880---watomubejijurafelutolexi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3b7234d6ee3644ae6c9fd091ff930d6f/lawopadobanebaroxomam.pdfIn PDF document text
    • https://edarky.net/data/file/28438493641.pdfIn PDF document text
    • https://dietacud.eu/upload/file/11044515869.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9946de9fa---50601717949.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8658c2233---vituxozugonebikuj.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee47d9904---24188852431.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8mof8s9qjlr5og7p0go78i3em5/merejetal.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a19222598d6---xagatepetoratifo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071836d1d087---65178815066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf+damaged+file+and+could+not+be+repairedPDF 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_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 11036 bytes
SHA-256: 590591f54366d2f999e53005372dcc441879c3e73e43a1c26358a39c8af6d5e6
font_02_sfnt_off00013969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13969 17264 bytes
SHA-256: 640baad0415f275f0c7eb11482df3b04b8bf651570916780dd83a3c1237f8cb5

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