Malicious PDF — malware analysis report

Static analysis result for SHA-256 c582f6b8aeaa755e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 08:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecd29a1d25ef6fd0b1e975da904cfdae SHA-1: 7d6f77680c663b53b61d6b612230c2fea4c9cf98 SHA-256: c582f6b8aeaa755e2692614714d60a8e1270fdf1dc64ea0b83d0d1ee81eb465e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://filipdegreef.be/uploads/files/60650328548.pdf In PDF document text
    • http://abwlanham.com/uploads/files/13690462553.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9bcc0db36d67405aef09ba3799fe11f0/30384902723.pdfIn PDF document text
    • http://mobitransjogja.com/files/jomubipidetevaxisesovedi.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/zasupetuforixufetiga.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/mipevutalixetunov.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/putumibewilutem.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/gipejofules.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/zasazovotafakili.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355bfc8c7ba---25882921977.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/24513638627.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/liboluvanopo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/38590725822.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/26989038065.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb1db2b1b---74737682498.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906065003.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/11035841984.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/15466158199.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/88a1256e330106e1c372ed12ed3ab5b9/28835868219.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907051121.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/381d564ff97c63743927aaaf10bd4528/natav.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090620354170554.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/geoiu92npb649jnscgmp5irib0/45142558131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+send+an+auto+reply+text+on+androidPDF 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_off0000b9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F8 10780 bytes
SHA-256: 74aedef5b314de1da2b69c25a701c7b8a73f04ebbb917c57ebb00924dba6524b
font_01_sfnt_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 15684 bytes
SHA-256: 1bf1a4efda9ee0f758121cf8ba3a6cbb0dc0a9ae27562ba598283f858a7c4545
font_02_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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