Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f33e72933a18fa…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 04:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18bf99c8279811d1c37667ad2d431700 SHA-1: 4c24556f0c91148e5e350d2179d646dfce3f0615 SHA-256: d3f33e72933a18fa04d9514f0306e75ea4b84f1c9046e0e37fab4692e9dead3f
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains multiple links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The presence of external URI heuristics and link farm indicators further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/lidixopufopoxezadoxege.pdf In PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/xutemodijevul.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/repevi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e7090e7ec---65142062782.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/60385594587.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/22307662386.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/fisugimejosesi.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/fanokoselogun.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/lebabebowijesegupukub.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109140505356381.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/54232023642.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/de498b3889567ad814b09e830f7f946b/52935966172.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/36006854403.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/50909414491.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/ravanagazizi.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/44095660458.pdfIn PDF document text
    • https://laser123.com/geektic/files/2413107677.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32650132250.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/winijuzawulexobirapulowov.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ul1bsraieiupthjgn1ffbcg3k7/79865293608.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/gipuvixafirufoxerasi.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/63876572548.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/tikoludula.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/linadobexafuxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=english+for+life+intermediate+workbook+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D2 17564 bytes
SHA-256: 75b8e9ca9ad6923da8756403024635c795ae5699ea680c1500057fd772e765ce
font_01_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 16344 bytes
SHA-256: ee4608130364547a8bbde332002371d8e9df7f337e5af294cb5d9eafb987a796
font_03_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 11244 bytes
SHA-256: 7743fb29ef098ce91cafe0eae27458a2e9f347c7f0eb1f1f57d36239c20aa067

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