Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb5bda2037c4c2a…

MALICIOUS

PDF

81.4 KB Created: 2021-08-20 17:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca26da854fe0164883cb6914c117958a SHA-1: 5a4e6bb72a12520b029c87ca03f38d11e58ab6ab SHA-256: 4fb5bda2037c4c2a42f220ebc2b2e5ad647c510d3c7285526d8127b9c5d5aefe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=percy+jackson+and+the+lightning+thief+full+movie+download+in+english PDF link annotation
    • https://fontaine-eva.fr/userfiles/files/zepulowinexi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab4cbd02f---xepelisomiburaxesanuwe.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/61563568851.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/6apligssojt24auo8u5i8d0fhe/tevebuzudulesolu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160704c23483b2---botojagoruxasijizufe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097c55e57b6c---12134725233.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/sezonirapemuvizuvoxap.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/17819800684.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/fuxuzazed.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/litepamu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fenifozaza.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/musegaz.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/01b9252f84e6399d82f4cfef2b05f503/18881426098.pdfIn PDF document text
    • http://llux.vn/uploads/files/taxuralik.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbb1e61b2---12893440798.pdfIn PDF document text
    • https://vleek.com/uploads/files/zapurifudeduguwajir.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jthlughlq7ds3ukkoph3hmpobn/kibovomabotu.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/vamolijod.pdfIn PDF document text
    • http://df-foundry.net/d/files/bomijalugulusoravetasupa.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/37302368570.pdfIn PDF document text
    • http://nincity.de/inline/file/bejudosaw.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d1864dba4---27524901837.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4071b795---16382690315.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/29214101402.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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 11512 bytes
SHA-256: 3eee27556adbcd985809195dcf9782e4b92e92e316c1fb67dc790d1898730246
font_01_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 17400 bytes
SHA-256: 769b5ee3ea2cca1f7a72f90cdfd18af473d628c2180e0353399d490780df0394
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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