Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ab1c19e013ee07…

MALICIOUS

PDF

70.1 KB Created: 2021-08-28 22:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8764da4feabd80002cf67a14e896c7e7 SHA-1: 673a8414efadff29684c44abbc0cb85f0278b3c3 SHA-256: 14ab1c19e013ee079d6050d2e8dcd8e9346a59ad1e745b336fe73af843cfc437
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=lymphatic+system+and+circulatory+system PDF link annotation
    • http://telek-trans.hu/editor_up/bigenefonidagu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/3831946953.pdfIn PDF document text
    • https://12shio2.com/contents//files/sobigekotepevafidulax.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e4491b80adc---97727132931.pdfIn PDF document text
    • http://101balkon.ru/upload/files/36355034760.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/58692192733.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/pivomuriwu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/16143146200.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ugmkc96i3t34trk044hje0eeei/turixad.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aeab496b1---53918525111.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/73014607998.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/varavujafus.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b14b7e8e---samoravijet.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/runaroviju.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/21976379465.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089290d7c9fe---65298465887.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/qc7f63nuh45jnbl1quomvifg43/navabimov.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bd7e0b4057b5b5f60fbca6c6d9ab6541/48948751178.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/54c25415689fb273bd77b4c2c893bc97/89157996618.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/6807622835.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108111116205914.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb7635e50---14193968723.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_off0000b573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB573 10948 bytes
SHA-256: 662df6f83fd57abec1f0b441935404e7285a310070e4df88aeb912297a2b034b
font_01_sfnt_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 14404 bytes
SHA-256: 8d3342c5088281bf02f87859da4946d302445f0c6761620de0946a32f22b310f

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