Malicious PDF — malware analysis report

Static analysis result for SHA-256 976be8a9c8ddc398…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 09:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fcdcd169fc162394cb454c04afbed897 SHA-1: 62c61f31006f3a09df3eb4b16189f7a806f5af37 SHA-256: 976be8a9c8ddc3988c46da1c0ee3e9cb7f87bef70ef0cda7eb13175fa3407aed
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=pc+assembly+and+disassembly+pdf PDF link annotation
    • http://www.annaleehuber.com/content_files/file/nimitemopajaseno.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/52033373302.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/27240628397.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/e68dtcn5upv90h90muiqtne20d/14698859923.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/fifenala.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebupajukaleludesa.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2a798f9601f71f9ad87019833f547cd8/36226805576.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2d0daafd---27257839805.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cfb470a1bb7f225d2aaf93723a2156b9/10453495204.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/45b0f46e3f39348f77e9527c75337991/19587879422.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fcdb94970910e319417bcd721365d0cb/dexefumivikisuf.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/14100260868.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0acabfe6555347e6e159288fa4e54e9c/65106693232.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/72f3bacae94f500f1d6e48d12a7e1b45/kizodez.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/39bea7572b5ec8a173864c18bd6b5486/rejakirodewirezalesasoz.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/26665949282.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210816113330150.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/kumitivogipinuzivebon.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/50063795140.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/75953130241.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/30833971630.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/vezajejurowatugu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0efbf92edf---53405091341.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47ad46bbe---vekiradodabizewuzafiduvam.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bebf07e39---63782942045.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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 10720 bytes
SHA-256: 4b853fef4482fc42d95b849006b6403c5bb16aba700b36e0c2e198ebd56f11ca
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 16944 bytes
SHA-256: d51eaf289641577d424e643638c22380b433c1cc623005595743cd236c418e96

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