Malicious PDF — malware analysis report

Static analysis result for SHA-256 9728b30d5af35ab9…

MALICIOUS

PDF

89.5 KB Created: 2021-07-15 12:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35193fa564d20295efdd01c90aa82a30 SHA-1: 26fbfc54fc53df3e284afb2a9c3a7f59dfce9450 SHA-256: 9728b30d5af35ab91f9edc800c5e55951ecc4d3e6d1ed13586c19fa86f76f7c6
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress upload directories or other suspicious domains, suggesting a link farm designed to lead users to malicious content. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://verkaufs-akademie.com/userfiles/file/lorizupusasikarodopiki.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bcfd7c7f3---86080603679.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/88969708667.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210619023004723.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/82328906359.pdfIn PDF document text
    • http://geose.ru/userfiles/file/xujibawiji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880571f0283---2267801764.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091b9fb3f47b---sumitilaso.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dcfe17f80a754dd3a88a98ea69406d55/bukezituwuvusipisanidamo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f45fd2192---vologu.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/38348202133.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f15d96a2---42039443860.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725f102f7e4---dusufekavamapu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68210db84---19893347604.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/87340545960.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/19385088232.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d3f4b4e70dcf096ebc71b7bc610c5562/labivaf.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f353f15c0---bavetubebuteted.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/572f1521b1a81b02d91c04c2b472be50/88907573338.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/76168974797.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/juzamopefi.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/97248125698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=michigan+sales+and+use+tax+exemption+formPDF 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_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 11260 bytes
SHA-256: 34ce2259f2c8e9d4a0bf89ac7401b3abf44a6e240f859f1faa6248e2c5e1ad83
font_01_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 17360 bytes
SHA-256: 340b2f29e1e11e5e058a69bb5f90e9cd2d89e5f2692a25c3b6bae7f9b6738538
font_02_sfnt_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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