Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dddfa124d2161a1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 07:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdea4e4ead3f2e53b4783da215c0b662 SHA-1: 36a92035d8a2abaf22ebdada55ca5b040528f58b SHA-256: 1dddfa124d2161a129e3e82e88653cc00e3bf3b8f82f37f748f27077f859b4a4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8a111b2452e73402f450370ac5012894/vuwubimutalabo.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/36382921872.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/l4rjsusf5qf36e54u9c0iv0jjv/vujinudexuzunesojolabuxen.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/mudetotegujak.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2am8uip3f5p0aobf1ait0bmuq5/24543308364.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1ihjhbo97jn5f4fo0afc2rrg0/44535837837.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dhhbb1ci1gqkrpt3pbs0aedrd4/46233540661.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/dbef7d7b7245fbb76f49d58601f63fa7/vezobe.pdf
    • http://aryajob.com/user_upload/file/bezanadasonorapafufizu.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mbrlkiihik7v3lvebf4ff12hq7/15272596112.pdf
    • http://4x4autok.hu/userfiles/files/38556604017.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f9b09ed047e21aa9db4a3462e6a2177a/96496745922.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/duir0er26e01leabsqhcgspf04/18951101308.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/87f0659a759ce853ebf3a5cb0543eb54/42532556662.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec762d43f---69889467558.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/64026822167.pdf
    • http://anindecor.pl/files/file/92213615182.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3c37cfdc---34121907962.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210601182614.pdf
    • http://3dsami.org/uploadfilefiles/fopevulevupowiraken.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/667731e8dd49e8aad5922d34d192464d/jepigunafiwikofatuzemat.pdf
    • https://aonetreks.com/uploads/file/5198234376.pdf
    • http://samnakthodrahassob.com/userfiles/file/45944936279.pdf
    • http://fsoa.cn/userfiles/file/puluzujolerexufokimalisuz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=interpretation+of+correlation+in+spss+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c02d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC02D 16792 bytes
font_01_sfnt_off0000d83f.bin
0a4a244ac11ead8f0c8c23d79741c9113704cc9b72e66ebf07dd65feec15c340
pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 16220 bytes
font_02_sfnt_off00010236.bin
e5300a86693b1c03893992ca61237ab6d074e7c8fee23b8524c07f7c505f47b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 10564 bytes