Malicious PDF — malware analysis report

Static analysis result for SHA-256 d187e09c3a9b0c7c…

MALICIOUS

PDF

94.9 KB Created: 2021-08-09 20:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5b7d5dd41c10a001e092a50684ea690f SHA-1: ff493494ac743d3fc339e7d1911f78cdf206ddcc SHA-256: d187e09c3a9b0c7c35d601f72033410b23a848411580d81cbbf31b5b7cc6d575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to various compromised or unknown domains, likely to facilitate the download of further malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.hgbehringer.de/img/files/files/6126957291.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6ngambar4gkk4hfva7svaaf2v0/jetefijepirizajokuxas.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a911841de29---fofijexemipigemiluxitasir.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ca50ad48bb1bcacbb5d27c4f6b5edc0a/73179838582.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1e2106a7596d917807a476e580b69364/xabozebaxomofaned.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/23001317222.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210731_83981350ECA6D7F0.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9da59e699189ef96941be3991a231413/24574651396.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/surafifixugu.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/75877109677.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb7d70f8a---zemusovivoniva.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/50174c4247745e2b39c655ea56f37db3/miwugavol.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/21098442440.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ec8b4bc16049af8026b0f0c854504129/gixefanekuxexogafa.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1859f62411bbaa9ff33aa0597af28d9d/wapuridegikubamuni.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d8f1db1c8---watabululolulijum.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/zedigiwuzajugufa.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jimoduv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d51bdd941---gosugojivurulimedu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/54371320359.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/nedujozaki.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/nixesuseziwasivuputupoj.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/96373346838.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/65942259189.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52b48a215b---89311820042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=adobe+flash+player+chromebook+2021PDF 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_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 11212 bytes
SHA-256: 8ee1c68c2ea87778c5d867e60ad80d7c6041920fb9a825a055f28803e5e732e4
font_01_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 17624 bytes
SHA-256: aaea48298b2958e1ce34dfa41ab455dcdc7d4c2f0838a72da3bb1b48469a021d
font_02_sfnt_off00015461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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