Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37f7e271e1be8a5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 00:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b10e32b183a1e734e17bf90cba7b9a90 SHA-1: 52af62d67951b0ab446c1b5f5f6e90461cd06671 SHA-256: d37f7e271e1be8a569e26f8574fdace97397683fe229e954f5ed0bd236b1c8de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=retardador+hidraulico+pdf PDF link annotation
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/gopalobuzivofikulozipaz.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/47756413228.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/biriwovexoseju.pdfIn PDF document text
    • https://olterus.org/contents//files/barurukobapunowogi.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/munasodajobefozeriwi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/283b5daeef93c7de8010ca201ded7531/wikoweroxazozuritoz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e9430730d---jefipikumejinujeronotux.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3c3a34c8351c47695ddfb00c3da91cec/55137570402.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/nudutozetovenomu.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/72093603950.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/ziwoxejezaned.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607967a63e82f---tafitixazugereweduk.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b446617---rawafopu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/780a22d1b91de8d0898245c7fe320599/207225321.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175087ab6c---giwuvabuzumobikexerexe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a46ba528b---nunuzijig.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/25039422446.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/4576927360.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/58778843455.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6df4acc6---kezuwevedarexabofepiriwi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/aerqpj7um9548ghfjuvvtl9kai/51114940927.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/68479705688.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca7c864f7---57251069636.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cg93lkpqogsqm857g59gtoerbv/dajoso.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160761d0d5fa93---nupofatisedapa.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_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 19284 bytes
SHA-256: d1d758efce542f5726bc54401a78cc2cd062431ad4cbe58687ce88cb8adbb447
font_02_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 10592 bytes
SHA-256: 81b8479031bccb34b402a6f9d3dc78c388e5aa9177d2e15f972309a332d8f599

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