Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adb89cc1043573b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 16:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f513fc2e31f4abb10c261525c60bb82b SHA-1: 422ea675ef71b5d4f52d72ca701f79e79d064e1e SHA-256: 6adb89cc1043573bf950a88b54eb58aa66c4e1cd60d6075b8c8cdb3f1c2eaad6
96 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely designed to host malicious payloads or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5795672ec3---87832999205.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/b79ef16af466fe2ec7491ff1506c0408/kulijuvizalap.pdfIn PDF document text
    • https://7gking.tw/upload/files/vubad.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/lijilafiluxalatiratexog.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74f0d4e769---55859016086.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/valug.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb82de657b.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/66576703782.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/negago.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/fezimegasekawisiguzunix.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea0003331---99003928830.pdfIn PDF document text
    • http://yilip.net/userData/board/file/21433634443.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bde0f850778c1bf56948c523766e9347/raxikolazosojeworoxumime.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/10890606668.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/7061000681.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4894776c---11149251869.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210525100030116.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/rexapujogizuzupina.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092081c49cc9---karegipokurozuf.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c460d935c86d65d37bd4c104c476730e/loteja.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/29062806940.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ae1aedb6a34f5a565882736a84aebce4/7220755161.pdfIn PDF document text
    • https://egca.fr/userfiles/file/pedobiruxori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cagliari+map+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 18008 bytes
SHA-256: d1dc918b219245bfec5fc2832598a09a69ca2af2a6d9d7c584eef94cde79146c
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 10252 bytes
SHA-256: 95ac088c9ce43db4b33c9bc9c4514ac85c75298995d29bec78f287219ef6c0c7