Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f8af9307032484…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 03:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90f7f04b02f9b56bdefabdb377c6290e SHA-1: 990f53099adc0ab6faf2878f7d62907bd680936e SHA-256: 15f8af9307032484656d7f4f3a7c3c436db55db10f005eacb8ff456335659740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9737c6c65---wefegovamugewivovotepok.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef1146c3a4---fozififar.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af91877a967---ritebod.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dip4kjqiopmbsg6i3100ibofrc/waxireporeterowet.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55806120851.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8dd2660f3de53dd159d8cb67017b6918/dulanemu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0bd87de9---birotefivadoxojulobubus.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608712877d2c4---tunawefopexo.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ebe60da8c4b448c6d6921d43471d35ae/jiramelovonovav.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/54563732801.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/rofevuvuxibak.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/81783246642.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/73f2cb9d8dccab8e6b8068fe40a90440/mijenisukibijesuk.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/98050795507.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/danujo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f9d12592aca409eec96a29c3776fba32/fexut.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/ripawewo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609222bda1dd9---29782809284.pdfIn PDF document text
    • https://jetaime-shop.com/files/18734038903.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8657b0168---61787938961.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/483b4eec20584369f97217fd7b7de0e1/43378937971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=left+ear+ringing+meaning+superstitionPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/05dc345282d7700327f25d0db3614c61/42197912827.pdfIn PDF document text
    • 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_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 16924 bytes
SHA-256: 7f5f860a253cc819defcad5d348124054eaff729a768901af01cd5da7d44c768
font_02_sfnt_off000152e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E7 10712 bytes
SHA-256: a8cf6e6704bf36d924e645c25c074986d2d547344baaaeae2e5200e568a50954

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