Malicious PDF — malware analysis report

Static analysis result for SHA-256 2937fa70e122b70c…

MALICIOUS

PDF

92.2 KB Created: 2021-07-20 23:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d872c86c24efafb5bad62429e9e33f7 SHA-1: 17bf9986a3ea6e588f9c358836a664ad27dd74b5 SHA-256: 2937fa70e122b70cf66dd2ba5fcccde942f0ac8b2e0895a3906eba3e06ccf4f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2af9e672d---nixavovatujemaverebulaw.pdf In PDF document text
    • http://df-foundry.net/d/files/xasexiweworovukigox.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40552b3cf3---xomedawupofak.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zonome.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074841c698c2---10371908951.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2749123b---68621148509.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3265a8dbb6c048e19926cd45dd173f75/63994976063.pdfIn PDF document text
    • https://sealskinz.ru/files/file/81993542625.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/vuwufuxobajoragu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e2625cdd2c4dbb7b9fcaf337962690df/zolamerow.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be59924b291---30239511042.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de8d4aad78---90309252776.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a966b22c77---kofokaruniporurum.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/muzikudanolamev.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/1ce10ffb04f74cadef8c901ee50cf990/59984209592.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/96368381571.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6d90bbfdfbd78d8d305647a77b4905ae/4268799365.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/i9u90teuml6s827r97834u5u43/bafikuzaposanaxapuneg.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/56958587815.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/xikan.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/95993506d4369f795bd81468cecf15ea/93757259198.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/597e146e102fd9d1e37dd6d30fe88af5/rekunelufusamowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=automatic+power+factor+controller+project+report+pdfPDF 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_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 16780 bytes
SHA-256: d1fbea574141f13c952741beb056b8744e7a8c50069066b23f0a12af248f6b0f
font_01_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 10908 bytes
SHA-256: 005d9903e342dbd85628bf1e1a266fc63b3c070e9ea4f3837d74bf703c544792
font_02_sfnt_off00014b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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