Malicious PDF — malware analysis report

Static analysis result for SHA-256 312d49d7f4169c17…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 04:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9351b9d81230723eb8a52d37baec80f SHA-1: d7342a58b522cb3ffd0572e1485b61b687da5140 SHA-256: 312d49d7f4169c17fd032aedfdc2e6c376bb4d0c79891ff7e5165b17c928e68a
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of link farms and compromised hosting points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inhome360.ru/admin/ckfinder/userfiles/files/jusanibakunoti.pdf In PDF document text
    • http://morakothotel.com/file_media/file_image/file/17150366990.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/lamudejigumavodaxepevaf.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/79203584540.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ccdb151b---xuvipalinutize.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/df3a111969659ff70c269e49591c8ba9/88533419365.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/kamepirudorefalusol.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/1794541014.pdfIn PDF document text
    • http://sdes.in/uploads/mifuz.pdfIn PDF document text
    • https://cian.hr/userfiles/file/memejebaramazik.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210903213311.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d6639d70---pugil.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c45e1364f---88772851074.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b543da8f1---tajuzemiretiwolow.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631831290/file/92253963217.pdfIn PDF document text
    • http://pasted-radio.de/web/files/kagarufirewilavij.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/37535548795.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/ridawa.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/2202666457.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/bigaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=open+source+manga+readerPDF 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_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 10744 bytes
SHA-256: 5316f279793001bbdf001fb216fd38045e6a0db6accfdbbacf9ea6132abfdfc7
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 17508 bytes
SHA-256: 0cbb27864a324ae692aef2aa0bced74acfe30e73a736010aa6d75bbcc66a54f1