Malicious PDF — malware analysis report

Static analysis result for SHA-256 8159be962cefe44b…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 14:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f3e6d35111e22f199a1c0aaee6f1ec4 SHA-1: 41f84b425b143275cbf52be792079866b4607395 SHA-256: 8159be962cefe44b04d6613d085824595bca19b8ba040665d670b1e29d095f20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2cd61156---numupimigeluxajeja.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e770df45fc05d0bac7efb02576807887/47787392790.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf486805cf3---texemavomuzefukuje.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16081147a371fe---50763257247.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/273a876feb7dea201cc897a121143530/19416030539.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/re8qeunrcaa81gm9fs51i9seus/81341350999.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4c6dd4326ee0cb43a214b7c92159c914/zetijiwagif.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/44375279303.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b30f77a70---35557698164.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/89cdb839a0dd5159d7873d730159b9f5/moreza.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3e631be9f---mujazutasidetexi.pdf
    • http://dragonera.cn/admin/userfiles/file/75267783026.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093e1c94b552---xiwutax.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7b2703f50500d686d10af1c655893fb2/vaniwevisoviket.pdf
    • http://www.look4job.gr/images/_user_na/file/goxizedugejukapiwawunom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=colors+song+halsey
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 16792 bytes
font_01_sfnt_off00010221.bin
825fff02eb324aceae64bb1f143f7523869660891850a0851f4305a507afd71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 10340 bytes
font_02_sfnt_off00011975.bin
74d4044548ef28dc9c980ddb57394b6526c21aa718bfd82a10d0e00811613504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 18024 bytes

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