Malicious PDF — malware analysis report

Static analysis result for SHA-256 00777364248a4b70…

MALICIOUS

PDF

85.7 KB Created: 2021-08-20 20:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 01706900d8a8705526ab3ba0716d27fe SHA-1: 145fd743671be6cbd0715c66ea772db0de08e31f SHA-256: 00777364248a4b70f5f42ab4187cf613e83eda4a54f81c917b8c1b5be7122769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=ejercicios+de+presente+perfecto+continuo+en+ingles PDF link annotation
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/f3334028cfa4b7aa577f138ee2c7d199/63234822287.pdfIn PDF document text
    • https://mytopics.it/uploads/file/18952361562.pdfIn PDF document text
    • http://cartopack.com/Images/file/6735288464.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f34db51875b---34863175525.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c188c4392---6227811991.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/42777327963.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/sevubotaravuwutik.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608573e16b5a0---bomuvuju.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/jibumizoxukekoremuladabip.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6097ca83f033eafc08693f82cceff10b/57659521752.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/hglpm8qafk9lhp8hgnq6gmutt5/73893239774.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efbb5c0d48---rimogofafukarub.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/risegomekajikeki.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ccd0685b0896359b3eb95d72d4fc5ce/fuzedixaxapixafavomoxexus.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/rosotozolosuvirukeloxu.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/wanibuturodefoduteromij.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/46372174812.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbd14654921ac03c72d0a19ca7c3b845/dobebudoxitabenekigu.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe555c8537---3170091510.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f11b7bd3dbae2bee0acc5bade87b543e/nugubifonugadabilez.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/50786130261.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/molexunamijejukexobugu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/texonofiludag.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4d06nbacg6jpm2cfieucvvupd3/zolure.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3e1cdb1301ecb384dcfbff02f5294b64/57593798107.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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 18108 bytes
SHA-256: 6949f7d60634a293810f68c65c2f140024d6a532ccf00316feae93022b4bc95b
font_01_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 10848 bytes
SHA-256: e38ff9755bafc25e45f6441be3e7eb71ddeeda21935473f32ae95ca7b8136dd5