Malicious PDF — malware analysis report

Static analysis result for SHA-256 757400561a050502…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 08:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0666c266a99d99cb635bdda56457061a SHA-1: d187c99c7cecd2dac30a3526b087d0106854d181 SHA-256: 757400561a050502d6ab4b907057b3b266b0f25afdd1d3c8bb880a4461c92799
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating it functions as a link farm. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The sample likely aims to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=demand+forecasting+using+time+series+analysis PDF link annotation
    • http://stringquartet.biz/web/images/fck/file/jivofadirazinilotage.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/5854740023.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/dasezujosaxufoduputusix.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b82340ac69f---gadilotofutuw.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/82681588383.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/72424227627.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608499e92920a---46950045269.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085590a2d029---reliferobos.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/3405045719.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2cb68e514e859fda6e48c14fba61c6fb/79682120578.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8530926d---buxizuputuruxoluw.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d63e1b6f1---xazariwadimuzufimeba.pdfIn PDF document text
    • http://www.520amis.com/upload/files/natarinudupo.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/zavodajup.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/zogutasubafowetuzemasusev.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fd88d3299bec2d95956c08e5bcf04779/39407628735.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c42b1849---31597881115.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f336c0af78---88253773322.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1754d14bb6---15285981105.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jduhfsutvv0040uraa591o6q67/42360613617.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/v1ik8e4uhlae1icn10jnbdasn5/55184974812.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3qpj2uce9mjihu41d8jdi763n8/45776210730.pdfIn PDF document text
    • http://mobilenmr.com/files/files/36614042920.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_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 11032 bytes
SHA-256: 6bd5f6cf49136a44677621027ed5977c734d274d40604ce5e94abaffc2600ddd
font_01_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 16624 bytes
SHA-256: a6530e484657f2aad0f933aebbccbcb3d60a912260bbbdff7bb2a626da31538b
font_02_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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