Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40cdf681add0f2d…

MALICIOUS

PDF

92.7 KB Created: 2021-08-15 20:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b9cbdb30536ed25db470c0f05361c7b0 SHA-1: 8671b8345790bcfdc4ee20a6e284b58fcb5c6db9 SHA-256: a40cdf681add0f2dd612d528a8e81a72c31c9d7ae669060698ba5be025514cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://synerhu.ru/uplcv?utm_term=probleme+chauffage+trumatic+s+3002 PDF link annotation
    • http://cocoal.com/uploads/file/vudesakitixetowamasogos.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/erko3dcsdn8ogl0ijvmi13uen3/lonijisisenazefuzubigoz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16103cd868d4c8---81917460335.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/35804638855.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/gefinuxululeludivamanona.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/95059353206.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d060c82315d72fe4fa66e516a7727380/vojunibivaxavunov.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091c88a1fa79---rasiwumumal.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d3a2c64e---fedujesunonuxe.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608155db2f95b---zimadizoludalobafadudop.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/30jo29tccfc157pkkmu3ut7gi4/gujadowarana.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/vegufajogorewogugego.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/wakinexubiwixetaregisegin.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96d6b3ed7---muzakalafixibilonobonis.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/261325411189.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/tegedinajo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c397efd66---57948063990.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tf8fmtnseouri2mniouq7lgm8t/gomipidanogukeruvotapa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/7c133ea3079d5658bc5cf652b694698e/82384840550.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/todekogifij.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/4424274442.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/oqm9qk336kaj6bkdf3erleokkk/92815934848.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qkem96s8ck06eiunn96ga5t5f4/73315353033.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/37995392007.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_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 18856 bytes
SHA-256: 04758e6af57ffd720745e8579b1a10fca943db04958a4d554cb9f389e162e8ec
font_02_sfnt_off00014832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14832 11332 bytes
SHA-256: ed608bdbc35e6354d17da833e84b2f5d4a6be5ce86215afe86ae0bc96337fd10

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