Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7bf06e09f996f3…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 19:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 23c1342352a9104a67b3127ace1e1dc1 SHA-1: ec9842965d16b967106f98758da8339caf279437 SHA-256: 4e7bf06e09f996f3bfa15625e22aa752e9fb51c9e69d4f26ea248d8febb83a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phishing lures. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=spy+camera+apk+mod PDF link annotation
    • http://www.ruben.pl/ckfinder/userfiles/files/27309629069.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/xololax.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/xirazewanapiwomavu.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/29558942464.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/wotifalefipemonexakulowof.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/69142770199.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109060220263222.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nrg57hdk7j32jqrde6u24e1m75/wamanixubele.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/62881757594.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3f8ae22a8---93310043386.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/volafozepenikeluzidij.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/batezoxo.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/81968492552.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/82923010874.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/26082533352.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091812550971.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307357612ae---43423449619.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/jedalitazuxevitovedago.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lefoperiwuzowan.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/38904488866.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/53140781435.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3hds33hinab0i4ao9gemq11jgp/32255050951.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/felediwobedobuwadoju.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/43178186287.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_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 17832 bytes
SHA-256: 0c3b75c41f3c03199e188e001e97fcdb9d61dccdd31f1578a1442ee3c2656365
font_01_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 10448 bytes
SHA-256: fa954c5c67f75238f9a18eee08ca5716acc6adc49714dc8659f90ff938c88538
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1