Malicious PDF — malware analysis report

Static analysis result for SHA-256 115bdef699829c72…

MALICIOUS

PDF

88.2 KB Created: 2021-07-08 04:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 92e17b0a9c43737722953da4c7cf42e3 SHA-1: 58cd36c192732844a7f5ec1f5de07aad920c3676 SHA-256: 115bdef699829c725bfb15ebbf0d68f20a4ba19c9744bfe472641d0bb2a0dffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is used for phishing or distributing further malware. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://tebsc.com/clients/84181/File/pogukezotezike.pdf In PDF document text
    • http://diclenakliyat.com/userfiles/file/91594715287.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/66355021831.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3f803e1d717d6704bdb634a135f2574b/memifadefevekevilegep.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/82403089536.pdfIn PDF document text
    • http://n-zvuk.ru/upload/file/66564690613.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3608ee0ad---newumuvokutez.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o35q2ghrglkrrro26c8c57l1fi/178199799.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087783a2a393---lumafulekexefubiru.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960b79e92ce---tubijilu.pdfIn PDF document text
    • https://bursac.net/userfiles/file/71372316794.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jimivikorukegenemodeliw.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/38013982410.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/839ab5ba1550369bb000baa5bfd83247/52232878943.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160878ea65cb3d---32575115762.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/15961254254.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/83832076433.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///kifevejolukegowixiva.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863ab3c791---80195916949.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8326c40c2---rosiwadowi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e197c488eab2f24fc7af57510e5cef76/ragagutimavakesa.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/99505332166.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd750eb75---91456991067.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/87461314811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ps5+came+outPDF 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_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 17188 bytes
SHA-256: bc4c51faa11a9ae5691cd732562e02b82b723efa6929ce5610b60acc22d4f175
font_02_sfnt_off00013cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD2 10284 bytes
SHA-256: 6552e59671a94eb6d39cf0c3077faef4f70ff042dd81078634ee4bd4b12a3583