Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13fc4b00cfe883e…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 06:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 144d4d6e713087098816ff86d6a725c9 SHA-1: 11dfccd388fabc10b08d109bda21994994f1be21 SHA-256: f13fc4b00cfe883eeda75df17380b66ff27ebed7de832bf59525d9a11ac3d55a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Multiple heuristics indicate the PDF functions as a link farm, directing users to various compromised or disposable hosting sites. These links are likely intended to host phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1700036004---rafawosupujitugi.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/14b7fda01d8abc494d1dd07a2e1e3aad/gujemomaz.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/tupinixopiwoxexatimikabi.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44508685454.pdf
    • http://www.elstar.ru/uploads/files/33393883769.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607247eff3273---5129368193.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b3bc11ec---wizuzuzusewalejat.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dae57b202---butegutajuxutuvaluboj.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609124ce3299b---21714285298.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160875f29033dc---wimiwad.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/3f89f2c913b20cf230e7cb2fa84727ca/59432155013.pdf
    • http://donateagift.eu/userfiles/file/13229026752.pdf
    • http://carszana.com/image/upload/File/98317386935.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3206ab32f47fc29b3c79c42728fd7ab6/89528235195.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/326a9df4dc58ea3e70f6e0f98c7db5ad/11429870023.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/59ae96245a446aa98d942683ae9e47eb/padigimizixadunixenunipu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2a9bd270cb8be3cb1db03e303025c4d1/vogusebuketidomimobajumal.pdf
    • http://sattamatkapatti.com/userfiles/file/sumasosuxemof.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/97091727644.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b5c0adec---19114759155.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1cbd2b2bc---54617555141.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712161083a0---5816651987.pdf
    • https://termofriz.rs//files/sasokogipitatol.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f0e69496cb8428666fe773039c0e9021/segalumunaxax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+convert+manual+transmission+to+automatic+transmission
    • 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_off00010e0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 16792 bytes
font_01_sfnt_off0001261f.bin
2615a9f6a13627f90de390d9eb1c5aad11335cbbaca45341dc5613b260f25aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 18300 bytes
font_02_sfnt_off000155d8.bin
2bea773561449ae5132591de3044e46ed54a4dcf293bfeb1a9ec6f2b70680254
pdf-font-stream PDF embedded font (sfnt) at offset 0x155D8 10632 bytes