Malicious PDF — malware analysis report

Static analysis result for SHA-256 a353ca44540e85b9…

MALICIOUS

PDF

120.8 KB Created: 2021-07-07 20:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a02e21d96e60f7a23d2fdec9e408d12 SHA-1: a9bd447d2e1ff7246f57ce68eb80f69f8a9cf0e4 SHA-256: a353ca44540e85b95320f81dd29215709b949f6732556866f9aad5bf467901aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=diagnostic+radiography+and+imaging PDF link annotation
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d05b54f3c92da00487d34e30771a7265/wujifurixigikulijanawik.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5e02468f8f0d542d376f70bc774d4e8a/77048204596.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/rejap.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/41283031738.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/79110287436.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7964b5bf5---womalukip.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be7b912db---vojajurawujasuzavunubim.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/95057686587.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fd35e690---93804763943.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/21e437f86957d00b5df54d17f57ad8bb/sixopupux.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2622e5c3---52420891311.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v75ropa7l6i0cfulnib0tb8bu2/gukajojagawabejakop.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1d0d8086db19af72d957b248150087e/89261377932.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62884059729.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/miloxijofomifukigiji.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/7496959135.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/aeb81da5859a3c35b33244c74ec50e78/33714188304.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4300708855633ae8d8c158d4494f1fbe/novemiwevipesasoragitetu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/nopoduberawokijogesik.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/gifuxa.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ab587445c---49925973923.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/rudevok.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/zanimumawaginiwatolaj.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/660997615c406e700881235704996bea/relorisipemi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/50333f909eae50a7f2f8418bdc9c6a05/pezemuv.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_off00017221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17221 10896 bytes
SHA-256: 3d8560149877e52d1da91f69a4f08f69dc0e874a3e882f0e103a101969678f1d
font_01_sfnt_off00018af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A30B 19520 bytes
SHA-256: 6112a4895fef8334ca120b5d0fb29c288db8c03183588b77f24c32af1e410316

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