Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec3377ad53270d2…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 03:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b1167c859afad7892c958a80712cbffe SHA-1: 31af629875ce1aa68d6ecec4d6caab7b6ff923bc SHA-256: aec3377ad53270d222c6e070b4a9fbbea4007a6479abba4de8f2652d3e556a1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous PDF files hosted on compromised CMS upload directories and disposable hosting. The primary attack pattern appears to be luring users to download further malicious content or engage in phishing activities through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/52urdg498mshn4iu45jp9t8310/relorijofewigipomog.pdf In PDF document text
    • https://bosgo.mn/uploads/files/wiwarebogisuxumabiv.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/67265712953.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1ddf3705869cb4c0d68d9bcfe1152dc6/82366885187.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunigedexalorojomad.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70beba5aa9---82476787576.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/87850688147.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/31569504250.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c9735ff84df97d8e3c4c64b10ee8e6b3/xisalifarorumawuzasa.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/94b7b54d825ca543d5f3afc85fe43d4a/naluxamolud.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72a208750---92730501633.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/piviv.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a3855694dcb---wexomoliliwomogojagasuk.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/874d68ea6cekncu1nasn5g6sh4/67474115582.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd8b55249---52939135645.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/606e09a28837ab13ec45637ca48c0bb2/7338228805.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b0ef30a10---fuwabevomezixenifikoki.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bb93f8e18af5d755398f2ec52dd23975/disogarugoxo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/bowotobop.pdfIn PDF document text
    • http://skomi.ru/img/files/file/vitelevowobobujero.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083338825a53---82540036336.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b73ae7854---nukugusukojimab.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/19281255618.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ccea0153e5292f3b382d843e209052eb/fakaleledisufarozele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=you+can+make+up+for+itPDF 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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 19548 bytes
SHA-256: eb1ab99c2c7bed9d15d14f15d9b13809e4e41efaffa53bed77b183ebce74da85
font_02_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 10604 bytes
SHA-256: 584dce21635d1f9c316f735ef5c0f94a4cc4115396fb2d40c8ef49524565f4aa

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