Malicious PDF — malware analysis report

Static analysis result for SHA-256 e257b4b7c5194884…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 06:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4cdf4081ae8b057d2b5419ad8413dc9 SHA-1: b19454ed35e9a339b30a9c76c5ccfebd8704fffb SHA-256: e257b4b7c5194884f70dc43b2ca7c63e985470157c7fe6cc189ef1ac1c337a43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab780b908a1---jikeg.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086da0112d64---simagubuvaradopavugizom.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a1b960a8---bavinizob.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7a7613596bc6f9d378cfe78d06fb1e71/37961882626.pdf
    • https://alshaabcoop.com/userfiles/file/fuvofogasute.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106230949033495.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f604718062---saliwibafezej.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/35106477487.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e1b3d2e2db9a4c21fdda9118b25bc0c7/87436336527.pdf
    • http://beergolfers.com./blog/images/file/18870388221.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ea3ce7c5c01185a2646edd339a5644f4/tagidakinakuwabitesa.pdf
    • http://crackershrimp.com/file_media/file_image/file/34680647168.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fi6lqrms6up54tcndh8pqk0sj/75920770276.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a040c25208---30827779223.pdf
    • http://abwessex.com/uploads/files/numubejulawekavidetine.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/27d4a4b04d8226ff022e3451a32f81ee/zovagajimurefa.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e3d71068f37ca8b70af66142b053e5c/vepanisulemob.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce94f5fc64---xopipovawuwusujufuwuz.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/b55cd039011e56c015ec315a7d0c7eb4/biketabirif.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/95945842335.pdf
    • https://observatoire-omic.org/documents/file/gozet.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/vr7v8tfu1ooprmi00f9fcohkr6/deparuzufujavirifomubab.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5ifip7o8d4r5bnt1b4d7ii4qen/45892879235.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/4ce63mvf9kvcdt8p7j9c2uk4e5/rekidexebu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=arranged+marriage+novel+pdf+free+download
    • 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_off0000eec9.bin
0ba0c03a616ed5e467a4153d79d49099a722f0e63139b4a57a6c90a742a438be
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 17216 bytes
font_01_sfnt_off00011bb4.bin
8ff3b471f5aec10422e3903639c6cc779d40c205b8c4c7df8fa78745b1b65446
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10708 bytes
font_02_sfnt_off00013414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 16792 bytes