Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1924e92e0c93f7f…

MALICIOUS

PDF

73.5 KB Created: 2021-06-30 14:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c7462fa539d520ee7cc56cae77daf07 SHA-1: da838a542513de46c35cd919ccdb0e8fa646d6c7 SHA-256: b1924e92e0c93f7fe5d822b021e95e375fe00c206d718410b5f8a1f5603395f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document likely used in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://oniceh.ru/uplcv?utm_term=ops+elementary+lunch+menu PDF link annotation
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/10713254334.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092a3015dbb4---69943010956.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/2319221962.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/547d91a2f1e095ff7df825b953dc5056/32264717948.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/64057272820.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/noxuwemuvukinokudolarir.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0ee3e97cf312e72cb792789c6948c43b/melupugidigavubedu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hlji4pinr7m8642ugksui5l5e0/senix.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/7569107775.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/3uqltnbld4tgs65lahees6tbuj/forodosarid.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/94749731609.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa616955ee761d782718eef2a8d22477/wabesosapelobomo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jvel982ptt6i07oeof7bt5ofin/76639602085.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/79668403923.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/63024915c410004960a483066de6dc4b/9476493406.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/wudonokorukesuludadiku.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a347912aaa5---tabobevixemabejav.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ef29b12e---voborudopamitu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/tuu7hb16l1pqhb5h1q9ga81dk9/faxivuvoketema.pdfIn PDF document text
    • https://jambukuning.com/contents//files/garezasobevevenesami.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/68ae03c45a1467b31b3a7e3e6c6272f5/jiropomalosewavetibe.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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16344 bytes
SHA-256: 76e063b0abde51984148a54d8000120bbbf453618b471623f0aeb44e85e06731
font_02_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 10668 bytes
SHA-256: ef67cb7305b0b799f9776b0e59833d8db2282786ec54c4f3b93133c0ee30f428

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