Malicious PDF — malware analysis report

Static analysis result for SHA-256 502a28f6eba4324f…

MALICIOUS

PDF

147.4 KB Created: 2021-06-26 13:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 553d063d7d59f9e7f64699e3eeee7193 SHA-1: 6ccc3a27fbf031a6c927ad65f42359cc2e5b2a61 SHA-256: 502a28f6eba4324f42785469fe8ea60baef1120cd4247638fdddf7f7b7463598
156 Risk Score

Malware Insights

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

This PDF document contains a link farm, directing users to multiple compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing activities. The document's structure and numerous external links suggest it is designed to exploit user trust by appearing as a legitimate document while redirecting to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9107

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099e322088ae---88555057026.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607360ef7e366---zakerutokofaxudodevivom.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5ohukei70p9jc6spbmmfsq29t3/worasinoxixivo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a81d5b5bc5e4d3f1395d7a1f59190598/1540687754.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/51285926431.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/42770544650.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a90e7e4976---lezena.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/48982879078.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c5425d8c7804792e6dd4d3e95aecc814/42502589170.pdfIn PDF document text
    • https://hirurgija.me//files/33638837221.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/62381684334.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d055ac3b291e8c1bc6aebe5d1f6bf5ee/vuwuzixuvuw.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ca5a5a33400a854982bacc884e17f9dd/pekalixebikadebuvonutub.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/jilogelunetizopumaviwanu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-13/20210613081828582342.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/magin.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609601a9374dd---26526089878.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/765d9c0754b32efa24fdc716eb9c95f4/15678297550.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/26102345844.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7c1e563dd---48808277053.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/60360669144.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858faf8d5e7---ruwasidur.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nobixo.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/lewopefoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=all+forms+of+susanooPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9C 18724 bytes
SHA-256: b32b08abf5390e48165b52bf402ba12f8f494046ae4d9b811d443a0e4402c9d9
font_01_sfnt_off0001a029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A029 16592 bytes
SHA-256: 3b5bf52827107f50626c091cc69b8f9e31be1363c88eb09f55853c6d7606f18c
font_02_sfnt_off0001b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B76B 10136 bytes
SHA-256: 5f7227a84c00f84fc5d29715ed7c2c8f050e05458e1ad834319836222d2e3863
font_03_sfnt_off0001ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE05 31784 bytes
SHA-256: 721b374676ad9b7013d5dc5a92d316d54ec4e419bb94459a920b7b4077e88bd9
font_04_sfnt_off00022725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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