Malicious PDF — malware analysis report

Static analysis result for SHA-256 126239d2ebe4b840…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 15:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 949c2edcc620d67498466d3d50069618 SHA-1: 63694bc1b8425cc31f8ece306a205dbe2f7119d8 SHA-256: 126239d2ebe4b840cbf5232f1e2e32f87bab6818fdae5e48a3b16b9d1845cf56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farms further supports this, as these are common tactics for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=reconnaitre+les+champignons+comestibles+pdf PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/40b040738e5d3c643fd9bd35232d5410/zetegizom.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a7895f21---waxoda.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/47169016854.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f410c07c7ec---nevulosimitulerorir.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf2f97d128---27685776136.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d581b9c0824---vugusogurorenawe.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/gewetejige.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/naxemalizadutas.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kefinuw.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/tikuletaj.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/11538111080.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/fokibiximetujasupev.pdfIn PDF document text
    • http://promador.pl/userfiles/file/38504985375.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/ziderakuwinomave.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/f3jk1jhheqsb2gj31aeg214ua8/togaxugigibuboxekura.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/51483943955.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7dadfbd42f36c8e8866bafe2716e2507/gulife.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/41094088933.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/kitajawanulaturabemexomo.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/767b56a0399db1377dd42e4b1df49e95/gubejokatanopin.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6de3d2d60---sinutuxuxuginoveresi.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/nb44elhqn7q522hr731ifeief6/jokazipopixozuluzunup.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dee0f2a21---55531602460.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161056ceb0a042---663437913.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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 11252 bytes
SHA-256: d0275286fa4f21c5b8698e0be51c614a3230dae2ad2c2bf36dbff75f7f041e83
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 18500 bytes
SHA-256: 095197fda2c0a181a37ad087a225e848aa77d317fc8d72e15f901a8d1c6b4aee
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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