Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86875dea16e3756…

MALICIOUS

PDF

89.9 KB Created: 2021-07-30 11:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 770fd6d893da8700a7ef24b5c12438df SHA-1: 268c40319bfaf8b90a3f4005cc6b24353b5ddec2 SHA-256: a86875dea16e375610512d40255ca7d08ee0a9d07b4ddb84b7795e660d34fdd0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on compromised CMS uploads points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99988072037.pdf In PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf9e2bf07---vivosifomopawexifamesomo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3883a8ffd4---saruxil.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/50998595058.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/40172413063.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/bumixizowamofowidiw.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609520a2d74e5---watanap.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/43566368963.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/83839571005.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nawemabokekovuwinebedumog.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/vugatu.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/popapamazitat.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c9bb4a89---fiparen.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/kejosebemifuzi.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/55973117129.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/35576757094.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa289eff3.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/8b9b2dd0002df054bbfb14d48d31c950/tegegomoxafuxokefovuwi.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/51151592532.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/nituv.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d2231162d---94693783495.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nnqrdi0p0q6rf2slk4sq77pfh2/22440711156.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080331799fba---fisofedibobumob.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/36221745585.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608235451982c---54813794632.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afa194b8d0b---sejakesilasevev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ninja+foodi+grill+chicken+recipes+freePDF 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_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 17412 bytes
SHA-256: cc874449dcdef9b9e05ca8d0fb7854d6059b413acd0c15eae586f582ee30e664
font_02_sfnt_off00013fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD0 11000 bytes
SHA-256: dfe780657eb0cbb7eba1d4e42a098cba861a5b05fbc0f318309b9bb59d762ff7

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