Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a10c867fb07e2f…

MALICIOUS

PDF

135.0 KB Created: 2021-07-29 21:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaa087d67cdfac019b0dc3bd56a4e125 SHA-1: 3f662cda1d6f6bbd0e35f6a1af0f0fd308d63778 SHA-256: a5a10c867fb07e2f64e44b9e1d81e6bba351ae537c628038c941f76fdc2fbcdf
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised hosts and disposable domains points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9626

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://drafthe.ru/uplcv?utm_term=baby+girl+growth+chart+percentile+calculator+uk PDF link annotation
    • https://schmitz.cz/res/file/8851876269.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408d842324---12179784637.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160961b05b7616---44757136741.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2a600b5f4ecbba662420c9b2c92a8170/retonetiburajulobe.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/32490936571.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7447cde7---vufodomapovakal.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/luhi0c630toh0sq1qk4gruhid7/pimipaxesokobidajuk.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088160346068---naromawasikobuman.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/terivi.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/23706782529.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/23207420369.pdfIn PDF document text
    • http://prestopc.it/upload/file/darurax.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/937323f7ed40d2d88262aa24370a697b/wipufusadeworugapezitetam.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/pilekidi.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f96b2493bd---puviduguv.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1a0a356123bec3e34212142cb855882f/12264122454.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/vaborubutimamifowojoko.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/29705770315.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915a48e6c63---83245421829.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39fc37f18---10134063772.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/7csl35drcr6vq5iuvq9bqo0gn7/83090713204.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7e44c91e---21529397729.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/magiwuvis.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/sedcfmr16j12u45ntdsi9mkdrc/xazuwukiwowi.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_off0001a685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A685 11072 bytes
SHA-256: 21e9dc744f69de1f76522280e887a4498aba1fbfbbe727a8c01385e7621b8519
font_01_sfnt_off0001c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D838 21224 bytes
SHA-256: 20cd0adbd657a350d01640370e0e5602f626d9c4d25c25825c672f9f1bb6b02d

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