Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7183b1c1abf0231…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 04:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 978732419f108b80464091afe12fc894 SHA-1: f65d1f1d5610026ec932467bf60e91df68b22e03 SHA-256: d7183b1c1abf02312a66b9bf17ffefa8b7352aa010abea08fdb819afdc8d371b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of embedded URLs and the PDF structure itself are indicative of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=pdf+dosyas%C4%B1n%C4%B1+word+dosyas%C4%B1na+%C3%A7evirme+%C3%BCcretsiz+t%C3%BCrk%C3%A7e PDF link annotation
    • https://adverto.ee/userfiles/file/vemowitumemokaja.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/67683212634.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a48617ac---60915815611.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/13134893838.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bukokafifiwuv.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b0a797f58d54e034a4f4947bab73d8b9/vewumejubigopufusanuma.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6091e3eb23---bupisivorodoroxas.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/tozenuturutuxu.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/zotunuwodoge.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/77499026244.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4ier4q0vph99rpr73ipbujus84/80431106444.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe96954af---33441179041.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/2416020967.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d529c0a6bf8---silepivupevedaj.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b336707a891ad3398b8015440e2bbd54/12684112722.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070828fc4448---kizapisufotome.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/3fbd4a053fa8180b532d739f5c8ac34a/gutaneluposu.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/natol.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/kotudo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c0v1s213ejnq17am2a1f1bhj94/33786966693.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/78312838886.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e9b55af00cc3bb292a753768a0787fe/16060499258.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/famexaxujepe.pdfIn PDF document text
    • https://kawanmto.info/contents//files/64316669490.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_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 11444 bytes
SHA-256: 094c66edc9071d9492e6df31bece8ade80e8785973c46464440aee270533939b
font_02_sfnt_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 19152 bytes
SHA-256: e3ab64220b0a987462aaaca076cf104b8c3357a845e4ae306c5b8aaf19d58d69

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