Malicious PDF — malware analysis report

Static analysis result for SHA-256 506fae2a7636c8d1…

MALICIOUS

PDF

128.6 KB Created: 2021-07-04 21:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4c1d78ec4fe61c2e34039ff67e4ce3eb SHA-1: 4e20d9bf5f9a88213a5ec54374d25e51db1f1f5c SHA-256: 506fae2a7636c8d10b27137f7ed22f040cedb94c5c23c72ac12f3bbc7ff090a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c3e931ba8---timufoz.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160916e9e88f56---64184267926.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/29g72eul270sh9hb8fhccnf4dh/kapobarupibosuvu.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/14219161509.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821429ed80f---bolidumudamakaxi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34e85bf08---62153653410.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/53358052716.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210524091305155.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7a87fdca---81475391560.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/gananebi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8e9f54e5cad42ca4058149266022d76c/767422389.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af229e4fb---52667390989.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/67213706184.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/rubumupavisemojex.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/37739212092.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9823f840---62859705305.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7372c12f---bomalatek.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/57ulo1o4r0pekdti2v0advqps5/20358011880.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/16411928907.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989bd9b75cb---tasikozarameduzepetuno.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c64d4845a4443e5aff1c76b1e8e65473/mukosuto.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/92786518457.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/38159034762.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/nubobowekanixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=early+childhood+education+book+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_off00017e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3D 17892 bytes
SHA-256: 76838ce4e802d571ccf182c6b60f5c101c84f66464d456aebd693062421b64a4
font_01_sfnt_off0001ace3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4FA 10980 bytes
SHA-256: bd1be5d09acab25ee5768155a29a8ea578a4396b98090980032469d6ec6a4124
font_03_sfnt_off0001de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE27 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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