Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8b678d2ea0e821…

MALICIOUS

PDF

94.9 KB Created: 2021-07-06 11:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7e9901beac12a9952d30e08a5d2dc73e SHA-1: 481aa2e292fe66a2a99f73005d2a2ef747550755 SHA-256: 7b8b678d2ea0e821c7a9a6ad30075fb30b3d10ae49d3284639812f8103b841a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and a machine learning model, with high-severity heuristics indicating the presence of algorithmically generated and link farm URLs pointing to compromised CMS uploads. The document body is heavily obfuscated, but the numerous external links, many on suspicious domains, suggest a phishing or redirection scheme designed to lead the user to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/nilaxatotuxuwomifozipubuk.pdf In PDF document text
    • http://fence-alarm.com/userfiles/files/beniwojevulenudugikirag.pdfIn PDF document text
    • http://winso.tw/userfiles/file/74635922567.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062719431464.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/xedipewikobibuwalowirolu.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/lefitumuzes.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/de0823d0f68fb496065537038cabb48d/37660569460.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609416a7ace18---34663902409.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fce17eda1---52364255705.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/46377477935.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/jujemodidumowapidod.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ff646f5bd16a33fa89ae71e44ea45b9/42588273863.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45423497eb---kipabifodonazekat.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9a666958a84d78f19766c75ab63d1a/lanusi.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/zoninonalijumila.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f025e5b37---wewaganokujeke.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc509430fdb---boredakizanebex.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/n5tbps1q2shikpm2hmq92ntr62/80962555718.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ddb049f143681062bb0a8940bc90d38b/98322002622.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/ef0207126b37c6957c613ddf40b5b85e/mosixesosi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5285a507e---nojedaf.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/13ff8be8350960977b74afe02af7fd47/41054653496.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/73607d45c7d87b45d56ef9bd0829282e/javolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+acoustic+guitar+chord+progressionsPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 10900 bytes
SHA-256: 952caef26ace559a90b8d775ed3f5e6e2299a998fb0ef4ac8fc555ccf4fa8c5c
font_02_sfnt_off00013cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEA 18028 bytes
SHA-256: 9a8c8c54df156688173f59189c1c3ee08ed87cc318ab8551ac25071e5363910f

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