Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff73e9ca6649807c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 15:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3073682c7f7661bc4457570d1d254954 SHA-1: 8f77ced1d1c6af6041b0404a0461707ef6a77830 SHA-256: ff73e9ca6649807c0e196dc24ee052225ed6fcafe12b522adef829aa1b579908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. This pattern suggests an attempt to distribute phishing content or malware by leveraging these links. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://dispensapertutti.com/userfiles/files/61521180946.pdf
    • https://digireg.se/upload/35240170793.pdf
    • https://ifbscalidad.eus/files/galeria/files/jinixinivosig.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/jagunivejuvegave.pdf
    • http://dpnovelty.com/upload/files/tuvodowevesosemulo.pdf
    • https://adeptos.clevercloud.pt/images/items/files/48726510040.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5ac6d2377dc073c1f88e6be8542a43ca/jadexedekeru.pdf
    • https://salwangurugram.com/files/5528891994.pdf
    • http://deltools.com/userfiles/file/41034845601.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b88e3b497da5671ba9aeb1b106ad01ce/redunuzewuwinavojatogagi.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/29157730461.pdf
    • http://pro-group.ru/userfiles/files/kebefozosizo.pdf
    • http://roycraft.ca/userfiles/file/61920799769.pdf
    • http://asea-admin.com/_userfiles/file/20210903100122.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/75784383792.pdf
    • http://xycrusher.com/d/files/8890840922.pdf
    • http://nadiadsa.org/userfiles/file/buluzewidoju.pdf
    • http://kondicionery-lobnya.ru/upload_picture/file/74545386438.pdf
    • http://ggmtc.net/userfiles/files/30935519901.pdf
    • http://taiwan-casters.com/userfiles/file/81567434710.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f6429dfd29660793c407f0a91db0e50/93090944106.pdf
    • http://alda.pl/ckfinder/userfiles/files/96071952425.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=angular+6+interview+questions+and+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db72.bin
afa16db80bb4649d266346c598f9c63a3c3ed00997452612e53401c506d7a1e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 17644 bytes
font_01_sfnt_off000108cd.bin
2d91184b922375feb4c591da25b65bc3f37e179cbad041e99c362cb617bc004e
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 17760 bytes
font_02_sfnt_off000123d1.bin
1465d451734c70db979843000da92391264a899cd19b61859bef0b860425b45c
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 11220 bytes
font_03_sfnt_off00013ddf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 16792 bytes