Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd77a95f4e30fff…

MALICIOUS

PDF

94.7 KB Created: 2021-08-10 19:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 002565cc49a1969769383f44e9ca2746 SHA-1: 34519c7b3daf16c48f80aa49a3c6d610055885ff SHA-256: 4dd77a95f4e30fff81d51f96ea1810febffedf8eec69c6f1706d62434b8a00a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the structure of the links point towards an effort to obscure the true destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ca0d5138---xegaboxegovo.pdf In PDF document text
    • https://vegas-shop.net/uploads/files/35980739645.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807af8de03d---fabadokilenuputiniwaxefi.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/guq25f2g4r8du63ev1frbog9k2/kimoxumife.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/18104244275.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f20f34f83217757aba0faf5a86f55595/56688745315.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ad460389---zivigonewugajugojake.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5762467b87---faxat.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b67619a31---kabobekipavad.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202152461357.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/87739632479.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f4e03f86---4428805603.pdfIn PDF document text
    • http://uci.ir/userfiles/file/41936307927.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/wagakoruzijibobevegisurog.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/32053804493.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/tenogelufitepomuviwo.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/14497864706.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/73161864984.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2c1cf65846c59755a673a9ba766214fe/11638167266.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dhjjuqb2qha62ieumuucdv6ua8/31797703106.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c44b5cd0---pobekat.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/ginub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+pronounce+numbers+in+greekPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/167062aa10bba4a60d67df332096a5b1/15727940232.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_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 10920 bytes
SHA-256: 04ef34b2f6b1e0a9e689bfc91d6ec73ae672b7eb2dc376200153bbaab1a1868d
font_01_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 22220 bytes
SHA-256: 44d1f8cc1ad76fc71e0236958832fbdf41944142b55ec17eafc78bf9bc8f29bc

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