Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28aeb13f6eb5583…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 21:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 672093c99e8042bafcdf4cd9dd557329 SHA-1: dd6e0cd4273b1449b69471f3cf216bd884eb9140 SHA-256: b28aeb13f6eb55831a6efcc2523ea61983333cf0c07580daf7fe7dcceb767336
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious payloads. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to evade detection and maintain operational flexibility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/f87768d8160cb51874390804848b497d/vojogasazolop.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7109032771294a592b27a58177b9e04e/manuzuturabegumofo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f51de5a2---7512691094.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5057fde792dedab18a456ca822b0a54c/88565474475.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/79bafa2a28f22e58a939340fb0b2a6ee/84031607693.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/taxeleborazuxox.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1827f08a---7149510575.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098a10869b25---durivasuvuwapurogotenixi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/xopoxe.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/r02el3jc1k43d7m5bhdtj9ae8b/rutexovodisim.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a88100ce480---94896983543.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/56589404084.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607330bb46453---61222706795.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/bfe5e000ab3d44de2604e3a27df2bf74/bedoxejisigugupekopo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f115643ec756c4fa7d65c42c291c1631/95010532954.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd17b22b183---21651043653.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052500050627.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d213c37d347eef87606993e284880de5/5864843747.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce634a66401---38112303119.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/xuladugebabegow.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c7634039---xamenojegotuwivovijuwux.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/j2vgt9m5k82rsfmor8mupdt9u4/71541867306.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/wirovutol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=uncle+fred+flits+by+pdfPDF 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_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 10592 bytes
SHA-256: 64c3e8568ce8617bed54b83ac8d1b9ddef1cb73a6fd167eb6941a9976ac55f99
font_01_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 17604 bytes
SHA-256: fd378843c079fd58f4c5aad3d01084a25f2276775e9ff338c9c00695a1377eb0
font_02_sfnt_off00013e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.