Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb95715a29ef28fc…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 04:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29f9d785230d45d050ffa35da586b080 SHA-1: 96fe12c4bba8a0978e24f28b969f088087a77c10 SHA-256: cb95715a29ef28fc9fccd019e5d1fb726f4ac2386da43916a717b976d0126013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=printable+word+search+packet+pdf PDF link annotation
    • http://ankaser.com/userfiles/file/juvedoju.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/61270522905.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kipimadimewulunixiz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/h54ou6jk0ee7572r3dapku38pd/38736194919.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/66552381871.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/60465342553.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8685ea50---bobegadopixigezaz.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/57363123113.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/murarefatek.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/juvidisofunoge.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1086b98ed---44432488893.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/99580938348.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/292030a3e3e489e7d22083a49b27a84e/64872173526.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/33884215947.pdfIn PDF document text
    • http://htwy.com/upload/file/nuxusimerexa.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/sisivemogatu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/297b4550a94d2eaec5e0597c8001784f/70914799478.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/25558124716.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/380530be1e2b263c65718e357ce82e23/77716208370.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/98120749637.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a68b2ab0237633929851797c91f3e76d/kijuxazujimaxesuxamavope.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dacbdbd9f---wozobexujidarijikaf.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/79802571724.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ad81ccb121e---20964231791.pdfIn PDF document text
    • 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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 16808 bytes
SHA-256: c3af675bc0012c863edb631e24d8ad36b4dc45700ea5c33accefde94b322288b
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 11036 bytes
SHA-256: d08dbf43f3dde886280073f78a3c04d8ab103b2566fac5619c688894cfd78b89

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