Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cadf9bcc6546688…

MALICIOUS

PDF

98.6 KB Created: 2021-08-19 04:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06692574caedc1206cde1b03131f7386 SHA-1: 3b51ae8725c76046ef4e29687707642e016aca2b SHA-256: 1cadf9bcc6546688a1c710f308f591be95f4c5f5b9eef851b8cc9d67429a88df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. These links are likely intended to redirect users to phishing or malware distribution sites, aligning with the characteristics of a phishing attack delivered via attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8223f5016ff80b46d8bc1dbdefb3553f/9297933503.pdf In PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/relapexolamapeges.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/jabapisejakiwixoka.pdfIn PDF document text
    • http://patroha.hu/file/61090358011.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad914812cdc---34986118526.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/47451304562.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5ee8c738532e89710570543d5c9f1b4f/peparanalizanojelikik.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/fafesazixetibizirigalej.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/31938452184.pdfIn PDF document text
    • https://nistd.in/userfiles/file/juvojudojixiwobogux.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160833c1a11d2d---70063691504.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/56635890226.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/vaguridenogisiwojunuxarok.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/barenodijidazodikutisa.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/lakidegegokowe.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m6k5pbeahcan339i3mu8ft25vb/vamakijimokepafezid.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/wujujosudigukeliz.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/45690260999.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/40839539933.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ebb853ce---sulunolerad.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7sl7amd0rt3uk1s98bocqk8cio/9241307441.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/wirezuponubogonizave.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/movilil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=interpreta%C3%A7%C3%A3o+de+texto+em+ingles+com+gabarito+ensino+m%C3%A9dio+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_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 19728 bytes
SHA-256: ad34e5a73bcdb0163f3b13140f37ea91f1b245b0752ef582dbb3aafa360217af
font_01_sfnt_off0001466a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466A 11772 bytes
SHA-256: 65aa609281637f68a8a83c8dde8be3480bf544fa2f4af59cd87a4d1c3227c801
font_02_sfnt_off0001611c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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