Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a6c79db9919c88…

MALICIOUS

PDF

86.3 KB Created: 2021-07-08 03:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6930178104ad272b140f86d9e1f79672 SHA-1: 26ebba3c66b88d450f2cea7b884cb0c59a52893b SHA-256: 28a6c79db9919c881e9aa6c5584bebff61cad55511c4eda831d41f49049dd4c8
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://allytemp.ru/uplcv?utm_term=stress+and+gastritis PDF link annotation
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5f1218f721126c29ac3519f217bc4cb0/gixotovevedubamerafuzimit.pdfIn PDF document text
    • http://builderall.info/userfiles/file/pagaro.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5pf2jm56uu0bkclb99cvfoukt3/ludafofud.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/lipurawezuka.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/galirejazowolonunanar.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d8076f1671e131242d85ea5acb017c10/nakobasofotojag.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/bekevejowed.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3138e93279---38542213027.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/43958813296.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cb43e977---revavevigabe.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9450be242637db00415caefe4f51712d/falozinixegowixemorodiba.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e488d2fc5---wibar.pdfIn PDF document text
    • http://llux.vn/uploads/files/42787941451.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f74811c4f---39631845353.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836eeaa5c02---pukomisevibav.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pegiwilopomifijidefe.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/pitakewebezaxufafonupa.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/dewumajaketegimitewogarav.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c127c6db---7679243890.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e1a020d94076dea056292fd60486b1f6/jodolitata.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8p0k2agvsr33u4ehlkcodc4qhv/58688184005.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1623998518833277370.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dc687a6e78cf64c6086c249f24c18e4/83884102018.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sigid.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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 10332 bytes
SHA-256: d70e2d5b809110ed7c7a7a40492c808ac30ae7eca47ee6fd2b0db52f2d68943a
font_02_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 16772 bytes
SHA-256: 7ffc33b6f82d217a034d20764dbe7eb5e4573e8139057b09d3dea77c6f8a414a