Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca596f99532f277…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 16:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab082f0a55aa24f6ffcbe8abcdb41eda SHA-1: 64102ba2f2664a10172275d061ae6a285bf29e4e SHA-256: 8ca596f99532f277ffe84d4c7fa3f511e428e2efb59a57dd208da1d11aec78d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=math+subtraction+worksheets+1st+grade PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2f95f4d40b28c95cc4212f4915fa65cb/14760317024.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e9dcd502---87085126102.pdfIn PDF document text
    • https://lasanisports.com/files/90713532333.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1c3a7000531d66d662dce9f927e68ac3/73856164633.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/e3ulib42hd3uku5ep3dfttc3ij/tepumigel.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6bfa6ea32---zofidawolomedugilujas.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/rqpt0rk3mjeo1qcsmbepr3a1ki/wexeni.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b89bb0f6---porunepizubuliz.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/m0retnivor601e2pf5aoib92ve/63411319723.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4e325516712b97892b73b85eb71124cb/muposulojorogogijovur.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/575411951.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/81689658572.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/21d5a410ca5bd55089442bad8e685684/rarafunusewezususizorato.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd15642e7c---19625270517.pdfIn PDF document text
    • http://canoeing.by/pics/files/58579713179.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/42264903337.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0e8a69d1---37679615786.pdfIn PDF document text
    • https://tisuputih.com/contents//files/30416583904.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081060b9425a---89536127359.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4afd5df5b7535950acfeccff508d1b22/kodukesawer.pdfIn PDF document text
    • http://traviet36.com/upload/files/zizumarugiwivilig.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9625b44e7f---mofelafixegib.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/27449849079.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/j69dats7hd4d4ubi9i70e6822n/puromizisivatupufebile.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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 11068 bytes
SHA-256: 625c3e045b024d7b04b61659422e8d61acdb46db5fbb606153e96f82944f9fc4
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 17612 bytes
SHA-256: 0ac05cea22f8f9bdbec1ca860bf885281a1d36456a8763ab8b2b4e3f09621713
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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