Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2719fc62c4235c7…

MALICIOUS

PDF

89.5 KB Created: 2021-07-15 19:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f748cfaebc636224bdbc18f3534ffadf SHA-1: 5bbb4a8be1f77194a072a6d7481133d7ebe638bd SHA-256: d2719fc62c4235c7d5fb03bdaa468fdf5ef57aa79c26115f74ab98b30ff5d400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=nursing+capstone+project+proposal+example
    • http://massintech.ru/img/outer/files/ketubirakiwinidonobidas.pdf
    • https://dianthusindustrial.com/resimler/files/wijokavudixuv.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8161990d2---71373013595.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1a83240e---zenutivavijewazivaj.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3648d3aca---96253221558.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1281c57ba---23248915504.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7d9da22467e6ab9dea4d38291f0a4687/96673680567.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc954b7ab---91196359101.pdf
    • http://ajivikafinance.com/userfiles/file/23392025151.pdf
    • https://termofriz.rs//files/43768875837.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/pizevifupisugovubadipuza.pdf
    • http://brezov-gaj.si/uporabnik/file/jamolaximipus.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d816d7623---xabinaxijujejesusoze.pdf
    • http://lacasedescaraibes.fr/file/kamowabedodi.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tqoaafhp5h2hs12ianfakgi6mh/39562494018.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/78708840210.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5878f1d5e6---72270899652.pdf
    • http://nexxosrealty.com/userfiles/files/mobif.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/217f1375ea7e0c3ff191a314bc3ea7f5/japapubiwam.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb622a1614d---78580096057.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0aca88d4---71483120800.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a503748996a---72298302819.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146fb0c43b---nolowagepavu.pdf
    • http://lycee-elm.org/userfiles/file/nepajovifonu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad1.bin
6117ef252f436489ec7baec0b7cc1ee7eec26b9d65401ae7d612fa9efdcf3c84
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 11024 bytes
font_01_sfnt_off00011476.bin
c78804a81e595f2815553d4223017edf009f3d2ee00bec8ecce0dc10c94b426b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 16840 bytes
font_02_sfnt_off00014035.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14035 16792 bytes