Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb3dd4d684b74bc…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 05:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02491cb7695d7e2b99793b52a4f772c0 SHA-1: a1c0d6a80db1509fb8b91dcc945204b493efca0d SHA-256: bcb3dd4d684b74bce38cf8945df8d151ef733e99593c8ba867e442be37d98b96
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=android+phone+as+drawing+tablet+for+pc PDF link annotation
    • https://gabinetpro.pl/kosmetyczka/krakow/files/40957764154.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/begobiw.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ruwoboweturubegaguvuresup.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/gibominigirubotimor.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/13145095967.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wamubizofexemugavef.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/kovomusalumoxawip.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/bitabilil.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/91759634392.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/41408628396.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gezolima.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/xetetegewuxav.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613942803ba9f---rebebazimu.pdfIn PDF document text
    • http://synhbio.com/upload/files/97700118761.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/4716027318.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/xanokuxomex.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/80149876927.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/37757580147.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/78002266427.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a66e5e7adce330a7599b0d722b207187/47268931539.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6b5434ad---25588801907.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/pekefaz.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/pigatam.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/ludusopafunos.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_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 17444 bytes
SHA-256: 8f691e5e5cfb44736cda6423654cadd2cc6f29187e0ec8699a600fe4ac692d35
font_01_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 11108 bytes
SHA-256: 153dc48ffaed00ad8c4ad5a95561c69d65b11e49c311e96a2bd8ee0479e9517e
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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