Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f1b222d2e42247…

MALICIOUS

PDF

92.1 KB Created: 2021-07-06 00:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e4c0c934cd4794d6bc0082e429bf454 SHA-1: 460d6da842f0cc183f3d0d1ee9839a9584a7d973 SHA-256: a3f1b222d2e422471d56d70ff6e8a8adb4c2a47aecbce26df8a6b87cd05a72ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution scheme, aligning with T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adria-ex.com/images/blog//file/xuxirozazodepokozodoloras.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/n6tp1d5ml876tbmms1h1afhoj8/92825881470.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/pozamoxijibuv.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/dexutuwa.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607845e8ebcb5---83790979576.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/36392993097.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a8b2747545a35e4a05319b3440e92975/mexujevetabagutadoviraba.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f3a29263---muwewuneveziputoketokur.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/femetijadifutu.pdfIn PDF document text
    • https://xistenze.com/files/files/roxarelamu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c8a892ab---jopukugifovuwofidejun.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210627_094322.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5df5f5888a---sujozuvuzofojopabijizevu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607038835680b---jeloxivubupozijara.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/18819067972.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/bugitime.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/3cc85a9bfbc8d9eb63aedf6c24ca66a9/99760884602.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/91413674482.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/04cb7ed9ff9059b26d0f89cd4bc0aefb/71543064769.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/r12lledpgg09kke2g52d463el2/67222681335.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/af26744e836b3e6ae947aa787587f74e/vuwus.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01805ab8b---32942986285.pdfIn PDF document text
    • https://hoalavender.net/upload/files/ratebuloratu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+mobdro+on+the+firestickPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 17164 bytes
SHA-256: 6eabd36db9289641d21a1ae3980676709ae11812c74eb5099c52388a0379fca8
font_01_sfnt_off00013184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001499b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499B 11052 bytes
SHA-256: cdffe2de3140cda765591a7fa6db0171e94ca7de048baceea5932a1c418e0ec6