Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d4bcdb0c02ac8f…

MALICIOUS

PDF

102.9 KB Created: 2021-07-02 07:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 917a1f622b85b806fdd46d0ed378c11b SHA-1: 52acb07166dab38bd168ce0678d72bd393f23690 SHA-256: 96d4bcdb0c02ac8f2e228d4a5b6c3fd4e57d364c61dabecfd155c7e988e0c669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure, likely intended to trick users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://krisoc.ru/uplcv?utm_term=nigerian+people+and+culture PDF link annotation
    • http://g-shocktou.com/user_file/file/basuxosajokite.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607612809dbb4---limumajonisi.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/meninevonanurifaga.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/632b8be8f663604b2c13c70e1d60e831/82260302333.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/tagubejelojazovu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078550e7d378---latemal.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/59864eb60f09d39e8c28055c7e4a0e3e/72390827379.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/takenixoxunezewik.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rpjtku7cu5fht8rnritp5esuii/dedivuwologajir.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cae0cfb0388---48815590699.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098434ece84b---24863549347.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b5073b4eb---rodofelovudekuto.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608987a30da63---44948154044.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/532d4927b83271d0e47c59add55b3442/51236871992.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6v87fcfnlbe3f3utm544sgefn3/farojimilibo.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/66425030650.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/sabunobijupowolitezizer.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/soxuvene.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/1458476292.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/93708042422.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b2882373---32612103533.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b72d66bb---fibivesipubefuvanewowob.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e1de8dbb---14338379315.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba983580ad2---xorobimonurazedotefilu.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_off00013099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 17564 bytes
SHA-256: 01d456f2c49b95d0610e6b44914a0c2b5e7c5760a6b91edf0c33a82e444b0a0d
font_01_sfnt_off00015df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001760d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1760D 10600 bytes
SHA-256: 4923d1a2b8c4d4ca254e97cc767f9398f1886cf3081295c40a8048f852b46a2b

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