Malicious PDF — malware analysis report

Static analysis result for SHA-256 071eb06bb0f3fb06…

MALICIOUS

PDF

119.6 KB Created: 2021-07-31 08:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b91b6355d4ee71056c69eb6afdb14820 SHA-1: 6cc6d95796571ffd3186074eb65c102fff2eeeb8 SHA-256: 071eb06bb0f3fb06b2fb083480ff710304bf9992a6ca7a533acb85407bf7d754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 compromised WordPress uploads and other disposable hosting sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://allytemp.ru/uplcv?utm_term=%C3%A1cido+f%C3%B3lico+tomar+quantas+vezes+ao+dia PDF link annotation
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/56orkqtalaqi7ogc201ec2nmk1/12486066851.pdfIn PDF document text
    • https://hgb.se/filer/file/32285358404.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c71bc63dab9---34967585130.pdfIn PDF document text
    • https://mmszke.hu/files/file/sugiviloxeb.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b9c13481080a82db1cd85d11a5e6c743/8996713812.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/pidus.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/bozizavodenabunukavab.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/19280334066.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/79158603094.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/rafekilarekupus.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/acd07694af2e349ccc4b0c90fa83e013/gufivovexowibokatupu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c457b4838de6cded5295b6e14d11bdb2/82051021569.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/69588ea6eb2353e9477155885462c53e/4617924160.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/5000284768.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2b7d8187---30015859725.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6580cda776---30188424451.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70186a5cc5---38417341165.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/15761722183.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/74378091644.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/93045408694.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bd38825a---59045568946.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/04246sjk4uupmikblgbpi5erp4/31548809889.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/s09h6eis6reiskcqed0epr5nh3/49785048531.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/zolenuwejox.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_off00016947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18159 20532 bytes
SHA-256: 6adfc1241a99ee1561705a789f7a2bd3f207cf721948e15a4b57e8d8ce9463fc
font_02_sfnt_off0001b41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B41B 11148 bytes
SHA-256: 0c8b35d0d634602f0850829c30f27296496eb7ae2980416b69004c8cea9fd285