Malicious PDF — malware analysis report

Static analysis result for SHA-256 c271420a8921a919…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 21:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f79534a414f601783a8475cfc98bd741 SHA-1: a623757330376a6b49e9fc9f2bae40fb59225b2a SHA-256: c271420a8921a919e3a8b7df18230f36588d7bd70577fd75c835855ea09dc856
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and the nature of the heuristics indicate an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://3q1p.com/upload/file/210708045449992127risrif9muhgv.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaac564e0f---88642558881.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/jalesuvumomokibiziro.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/263a5f55d64d09c790624c48a167de76/19916842833.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zeterajajepavidenom.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/12916356509.pdfIn PDF document text
    • http://ymmicro.com/files/files/95996959558.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/36499186019.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/87364708236.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/zaxebifawi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6844bce867---29829535508.pdfIn PDF document text
    • https://matricula.arendic.cl/files/45692796071.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/97040593028.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///vejigubuzuka.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/78484252594.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/29836909940.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/inbbu879qnp4ac1drm6vk6qtoe/52538894901.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/82094330365.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/vojupalesodimezu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609650a9e9cc7---jataveromananazamunebalup.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/92047343729.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3d8a00d82b52b6eac11fb84e37d99f5b/15437402902.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210629140735_NjUyNzM1NTczMjE=.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pengukuran+dan+angka+penting+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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 10532 bytes
SHA-256: a479b8b76c000523a9c80545307613a0f798c8b30816b68b11eac6b45db35e01
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 16356 bytes
SHA-256: 3c746a365fa63fb74e21adecf90048c05eb490497664c55d172af4e4cef5c70b
font_02_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1