Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1bb8efc0aa5b68…

MALICIOUS

PDF

94.6 KB Created: 2021-08-10 12:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 0e94fef807527b73eb6f3c283885f5d1 SHA-1: a1576ace83376e5ae82a5889ca5d54afb5714267 SHA-256: 1b1bb8efc0aa5b68b741cd41e31b5bcc8069c01bb831267e733339747a916546
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://hglobaltourb2c.com/FileData/ckfinder/files/20210726_552E5118674D2503.pdf In PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/vasutumebijunosizobur.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e04213b1---53558574269.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1aeb070c3c034ece1b2b188fb1eed869/jupas.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/svss324b5hnogc9tvt3nh9g02d/telutezifibur.pdfIn PDF document text
    • http://talleresjpg.es/img/file/vikapujibub.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607786600b8ca---33078760034.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071bafc20cbe---bizijafajujamasototejuni.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/namodewaxedadafemokiwofux.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/61442020364.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5ecb5b38c626b11e860cbc608028496c/3907459058.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/72895407127.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/76724370698.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/18322372194.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c1711f0d---94464962972.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/860923f7722e6142fcbab1c977f96301/82710630590.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965339a50d2---nafiremopalewok.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/itimmiv87f7k93f10ps4vq76m4/zodinizimaxa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c21f9870c---guxazuzoki.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/wusaxobogaxob.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae412c74a5c---65482290435.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44e14f6cb---jokekal.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e34513d0---zojepabumexirumidexiru.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/64143497260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+take+meeting+minutes+action+itemsPDF 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_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10696 bytes
SHA-256: 0cf60cef3cedafa9dabaf8d575c4f24e54f9be8c9356ba7ea7892cefb3d51830
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 16620 bytes
SHA-256: 7dacd215d9bf8fddcc65f304148c809323a2ba3eeb2af0f6be17a9f2c0ed43af
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 17312 bytes
SHA-256: b06c2cf576d70ae985ccf7f6f6b9a0ae8cbbc695a528901b9b8004328095b225
font_03_sfnt_off0001544f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1