Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b38b6dc3c980261…

MALICIOUS

PDF

170.5 KB Created: 2021-09-02 22:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b38d9f5e4e9bfe1b202932d5190963c8 SHA-1: c9282b1f406e91ed625921d5f5c7a772e130a130 SHA-256: 5b38b6dc3c980261023a1e8722ecc9adf454135f192c602bc44a68908cb1b41f
156 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, with numerous embedded URLs pointing to potentially compromised websites. The presence of multiple 'formcraft' plugin URLs suggests a common method for hosting malicious files or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9218

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://securitydm.net/slicice/file/rimini.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dab5c634cfa---mikidanapovelapaxarunadij.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/vutupenom.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608402264c59c---xafaxonakebugebefive.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb54cac047---47973789463.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12fe8433ea---56276869507.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/8930727320.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/65485819161.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f7e0f4384ac973cb1efe1392a44eeed0/67968645286.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210831_015418.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d0502597a61a8f1db7c610bacc1d9da/80369788678.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbecf871dd---pavekotegowa.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/616iru6c1bhkunclmciq5gagmd/pejejosamede.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f580b576c89afec8c8314108e8d62c19/10107160976.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a25c5b3dd051fa3ae94d426f19620007/54138674562.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160848e15897e3---78041744411.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/87643120054.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabb088334---xidevisebe.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/17f8422c44427664b79813d06f72b87a/8050715582.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/66487901575.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/33249752544.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7b2cf4aa---tawesobimawaniregitajeki.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/vafunapafizixovunug.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/39210486084.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b93f7d24cf3---70176544070.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/59837511783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF+%D8%B1%D9%85%D8%A7%D9%86+%DA%A9%D9%84+%DA%A9%D9%84%DB%8C+%D8%B9%D8%A7%D8%B4%D9%82%D8%A7%D9%86%D9%87+%D8%AC%D8%AF%DB%8C%D8%AF+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000200e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x200E3 34404 bytes
SHA-256: ff0cae6fee950e2a8b91879666611b32396469f5e3d61a8fb4495ab0cb6ebb49
font_01_sfnt_off00023d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D9C 18920 bytes
SHA-256: f12986d56865481dd518e65a0a0f80bcfe1428005932875df5f25de7f5452af6
font_02_sfnt_off00025d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D58 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_03_sfnt_off00027137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27137 15456 bytes
SHA-256: 75b1cca0e180d28cde77559a186db2752380c9f654d9015be827ad3878cf1c38

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