Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79dcd527261b827…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 12:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb5a988abb66e1238d00fa2261be2415 SHA-1: df8559ea2a84d0ff1559dab98ed94e1d32758839 SHA-256: a79dcd527261b8271733b454ae2533cc62262c19184e27c3206c3844da8221c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as redirects to phishing or malware distribution sites, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a4042f46d62220ea65feb77657e3ada6/34302847947.pdf In PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/45c26353fac3898476de286af3b95003/gelodupixalirafagijemo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1be4e20b---bixosazadefusonixazisevid.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/kokozuxitamuxed.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/835b87fc0a14ad873b20968be9ead242/nukudiwijiduk.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5iqtoeejelhn55fbs8a3unnkvs/53340876458.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zarirajija.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a82290c0---busevuxirozifuz.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc811b693dc---52589412797.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/larar.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/69050270526.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119aa850ba98---34394458720.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7bn0p2t90l3j4js4kf717hlt35/vizikulipabaxorivawita.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/619b0fe8d07c44729d000f7b4ce73fba/53110186897.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/9027173167.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/daripejufeg.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/49560576893.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/52272988586.pdfIn PDF document text
    • http://industrialdevices.in/uploads/xuforenukeginagudepakib.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/14134954896.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/58ae45dc70edd8f4aee4b640ab128a9a/47958598151.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab918112002---63130405384.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kiritinu.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/84070538546.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/84974850119.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/p7hvk2f6aj7pdjba6p6ct73aju/berorawiwiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=convert+page+to+pdf+phpPDF 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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 10568 bytes
SHA-256: a0176cff8bac21e39f64da45420a166059d5f13e84d9da5aeb0dba97a79673a0
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 17940 bytes
SHA-256: f425fe8e9f70a5e74f69c464463050ee1d2ea020dbcb2ca1c6be48ef658ce4ea
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1