Malicious PDF — malware analysis report

Static analysis result for SHA-256 1399c47ac4f06238…

MALICIOUS

PDF

104.5 KB Created: 2021-07-26 22:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be64d430aa10391d48e2464b3a58bbaa SHA-1: b457ea08cf9a73c4307d5931dfe30c0ceb281623 SHA-256: 1399c47ac4f06238a3a9fd35cbabd32d500f2cd8e620e22156a4dc0ba9c93fdc
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fe541d478---nikugiwexejiziwik.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba42a8527d---xuditujod.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/77423334042.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/02a28ed4af961099c815da6ebca4ba2b/57925665572.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/giduvedotevinalevux.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500935f041---70500430847.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/kuwov.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/depusalunusegafoluw.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/joroxosilakivukazojewiku.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7993490b5e3df73a3aa1b2bab6cb8d94/7102230366.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/bd0b64cf11b7cdca520fa9acf50a727e/zeterezebur.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7c4b7e07---limolajewu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o75v31hqt3iaaunn5i3dha6vp4/kadewojemuvajareruf.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9d0667466c58a0fdd32009851c3c0bed/91857037253.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/jodixeki.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfafa95d64---93724142452.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/24910743767.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/butulurumupu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2u778hdv96cdlfpaj1blqlo77k/venipizadelipalazer.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e47f75e2345---20004186181.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18baf0166b---dotuxigafagewem.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fbb99ed8ab02e38a267ee4897d9dbfab/57337776359.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/wepixutoketoze.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/76924533762.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/21302217037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+are+the+steps+in+the+research+process+sociologyPDF 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_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 16588 bytes
SHA-256: 859262e3115d4767ffe2d923d92002a25756b3a85ad98947b9b19b7ca587a693
font_01_sfnt_off000160dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F3 10760 bytes
SHA-256: 446a0401f8e95e7d052928488958d35d67b50a7a0215ac9afdf4416f26071c65