Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbcb660c5a53b06…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 18:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 399e81360b2b3aa5b4cc818b0c8210ce SHA-1: 278875372cdbc165f5ead1aca8e5b85e03303d3e SHA-256: bcbcb660c5a53b061b4ada0f5d3963ea888c65c16e29cf0d8ba15601bc336044
164 Risk Score

Malware Insights

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

The file 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, directing users to potentially compromised WordPress upload storage and other domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb2fc050e1---lazovuwutozaturusewovezi.pdf In PDF document text
    • http://staceyasp.com/UserFiles/file/87781209514.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b23309653791a98156756687838a85cf/vopazabekaketefiwobet.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/didebewiwumumij.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b1e1f75e---varorekuzukone.pdfIn PDF document text
    • https://dafelia.com/files/mevofasawofu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2c41b2d31aee6f8390a68c7ec233cdfb/zimafujonekagitasojuwag.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856c041725f---48692194184.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/88838955096.pdfIn PDF document text
    • http://benetalent.com/upload/files/61836893300.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/gadumobalupaxofufiji.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/gafus.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/97231099146.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/7789aff5d9fd14606f6008da7e03559f/surazoxoparivubebis.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7e1b88797af9897b3c1383464f01259a/lojipegabozixuro.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3507d2a02---1042118459.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/gepebefumob.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/83378372061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=larry+gonick+pdf+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 10644 bytes
SHA-256: 0b99540d2a40b305571c5721380700e9c2b5c0fcbf14258b7ab51cc68082cfce
font_01_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 16228 bytes
SHA-256: 61cfb4368cfd0438ceebf8a2c9ea83363a1cd220b0876f6d69f89ede663cca4a

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