Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccca7b4d52136a69…

MALICIOUS

PDF

108.0 KB Created: 2021-07-01 15:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa8b583e516246aafddc1b6978add6ae SHA-1: 031abb78efadd5be976a8df65dc24e72617d5820 SHA-256: ccca7b4d52136a69fcc2a89bc454037fe62af513e554b526840cfd1e4e4a4961
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mikailang.net/userfiles/file/20210621042429_1863555296.pdf In PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87faefabb---35487963775.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fq3imjhg41jc3848ska5ok2n66/32301588102.pdfIn PDF document text
    • http://consade.com/userfiles/file/26770601037.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/98977755029.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b1807aec---xoviwovewajilinasutad.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084213be6f0e---bufafoxuzojuz.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/44403844057.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f55035fa3---44074039022.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/37583568925.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kojabipageguruserivabebef.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/768122d40b69b84bdda83a6d6c4b42e6/90921738638.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160708609e198d---navifenixiselaleledubetud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52d1096fca---tafemopuwuzewokijanok.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3d1141ce685502ce06793cbe5d85291c/pupugososab.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/wadiwafopipimigom.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf3240ed5---44380660783.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f5197f753891e493c4590a5bcc38ffab/87277753547.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b36d425d1880f84122492c30197da8b1/sodigaguwelig.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nefadosipelawo.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/48570900002.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8d1ag23nqsla1vgfmee3sr2rn0/30285057921.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b486d00238---72353814620.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609347bac9858---jidozedorozosidevedu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e2ae640---vasadejigata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tokyo+ghoul+episode+onePDF 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
font_00_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 17740 bytes
SHA-256: 919e04f2e98eba2c7b60348674a9cdb7c364577962d00d165111d4798944be74
font_01_sfnt_off00013f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001577c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577C 16232 bytes
SHA-256: 055d0aa04b039864f6e01f8ff5a592a2285400d87c0e49729a1e8e4feed68373
font_03_sfnt_off000188d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188D0 10580 bytes
SHA-256: fca870801825fc690fb5e5bde95877bfdc141e688bd2e21b6bb6acfbc611d676