Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a2f79c4cd48b81…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 07:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa928b45a7d285df071c4385d449f9b2 SHA-1: c86014fb89a63c9d2c2f304d2031492c1b6275ca SHA-256: 10a2f79c4cd48b811d9f3d04b55bd7b4cd877cb6262b377cd466a1c81ead457f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8ugevgquv08m54ukacq6cnectv/gudidemikujuja.pdf In PDF document text
    • http://perfect-gallery.com/userfiles/file/9481582137.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/oqtttom69nh8uc2nolhjhi7cq0/risoxeb.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/pobesirogelaputabolumuna.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/mexawosivonagizotofod.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ab6e7c41---18833035267.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/12811420847.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/27272705291.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f44b4bc71fdc1b0d622ae89a0d832d6d/50111868434.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/79097527846.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/49249004258.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/31053769897.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/dukazurafi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/67758761195.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/41987779217.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9e22369d---zulopono.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dufuferubuvugafolujoz.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/33081681450.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/35657269266.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/54781895452.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/4034130586.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/26324491453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=spinach+cob+loaf+with+mayoPDF link annotation
    • 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_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 17164 bytes
SHA-256: 2b951f9ed7ef83b822f6473b755097f48411e65535969a07b36879147d41904f
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10760 bytes
SHA-256: 575980d4a1f5d24063c570f1416b63569ad0fcf7589fd9ce1aa8257b0c72bce2
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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