Malicious PDF — malware analysis report

Static analysis result for SHA-256 612ca044d4252623…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 12:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7911452c8813fcb25ba8591ff99cfffc SHA-1: c1ddbaaca4564fdd3729d91ddc197f78c4399c8a SHA-256: 612ca044d42526236db02900849c5a0a9ad388687c4fbccd7a98d1c476ca7eff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=ad+blocker+for+youtube+app+android PDF link annotation
    • http://moriefrusca.com/userfiles/files/7479395302.pdfIn PDF document text
    • http://poiskvod.ru/images/file/fowuzufoselovunixibatir.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/dedopizumem.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/31048169900.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614046cb60ef7---tedofefisujoxete.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109072118455951.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/tajedit.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/pugapuliwasina.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/gulidon.pdfIn PDF document text
    • https://sopkambing.com/contents/files/11485849310.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lttn24icab1cq3tt0gu4q2d633/jaseva.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/ribokuz.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/67662772977.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bumit.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/23931463273.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/liborufapusutaburelale.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/17847899629.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/77973970908.pdfIn PDF document text
    • http://trieuduong.com/images/Download/21323204628.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed98ac521---xigubaretetin.pdfIn PDF document text
    • http://falconltd.pl/cache/file/tutajivoritijerofelemuvo.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/61716937238.pdfIn PDF document text
    • https://simorgh.it/uploads/file/dujudenofarezixeb.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/7100112721.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/29749494148.pdfIn PDF document text
    • https://sanidom.pl/img/file/ronitumesepepadusudukebuf.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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 16560 bytes
SHA-256: 6454e81ac8e1eef4ac5ce998e675e0c44a7c3e16862d1f7fad7db89e97ef4234
font_01_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 10872 bytes
SHA-256: d43729b110ce7b484cda86dbcc556bfc03208fd2d930a89a21948476a40de706

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