Malicious PDF — malware analysis report

Static analysis result for SHA-256 b645379005a3c5dc…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 11:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 787593d98bf45a7e248a2b83d96f806b SHA-1: 48629809208ecf6d9a0583b8e4035eefe38a4698 SHA-256: b645379005a3c5dc58e28ef69dd4c4dc38f0a0b3d8ecf30fec4f162a2ac14527
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. The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL analysis strongly indicate a malicious link aggregation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f0788aa3---kabekefukawudo.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9752a2a3b0bd383fdc806a1d5aed198a/kiwakajesivodefomaviw.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7lgfl48m34l5372e5sk32ksjej/44737247946.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607863457e659---namurowo.pdf
    • http://j-line.ca/fck_upload/file/setegakugedirejafijuwosov.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a136a2387c---genabomorafivo.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/08815262bb256cf223c613e74e09e6a2/bilixoxefazolakuzot.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8541fda4dd52fa154b93539ee2ea5502/17723249435.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee605cd39---fefefege.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/57ooh2n8j9sfbudjvu2qr4qtk0/tekixifubomuvazibo.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cd46caa5d---74364672570.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d735872d---sodulaliwa.pdf
    • http://goodtraefarm.com/ckupload/files/64792584290.pdf
    • http://interel-rus.ru/test/sites/default/files/file/tovukesubudumo.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402edd1871---kavoliwafagisomugokiv.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8917c99800d59a4dc818478560701f32/22636493730.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ef8a1b81c08c9032bd17ed0c1e216964/83770226505.pdf
    • http://mg001.cn/upload_fck/file/2021-5-18/20210518072718202508.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607caebd56d2b---terosemijukeso.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32301725d---nakurotuvitu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5b57b3ec---77673584882.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079264f82199---55169189337.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=floor+plan+images+free
    • 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_off0000f3d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 16792 bytes
font_01_sfnt_off00010bec.bin
d3e234e2deb54716593b6aa2bf6bbc6cda745f738f49706bdf1125afd69d6f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 10580 bytes
font_02_sfnt_off000123f4.bin
044cf61eb2bfcd68ddc6507c0063726c1c8dcadf5fb0796f52df5d7ea7be97a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 17064 bytes

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