Malicious PDF — malware analysis report

Static analysis result for SHA-256 78af323eb3de7cb5…

MALICIOUS

PDF

72.2 KB Created: 2021-07-01 13:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45fcaf672b0f1faf651ff51dba644b32 SHA-1: d67a91ab4d6b5ab434dbc0209ef8cbb729a1cb4d SHA-256: 78af323eb3de7cb5624cfb1bca87d231240aed4190894001b3e84b1e94cfcaa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079789b13970---towafowim.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078dedd037aa---fobezafosila.pdfIn PDF document text
    • https://dptech.vn/uploads/files/poluwenetedakawasiro.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/seesmmiq4o4e8sdp7s1lvpqj1n/21462008794.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fodonosuvufejuw.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/14326601726.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xixakadaxibanu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b5751c16---33369982888.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kqr8q3bu0hhv83fdbhljleqre8/90343406778.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1dbba7f34---bazivigewakozewazit.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/37c901d5ffd059ba5a774d18ec545c4f/sufalevesosov.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fj9f4fsccob71059pvt92bfj9g/87406061436.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd82a61e163---88021465606.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/9933601169.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/lobutemimapelinalux.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd69227e5---50032513788.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072137430713---79084227252.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a619097232f---fukekalozuguzakabu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/76332929778.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pm05gmjvb8qg2j9gb2c018s8jj/jarufovuranugup.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/d5h3ur3cmkaua5u8ai0v65hev7/53330978283.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9eeb2c4bc8c600f8eb7bc0aa3c5307db/sidat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hath+ma+chhe+whisky+songPDF 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_off0000b971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 16348 bytes
SHA-256: 52191a5c7a34dcd098295d6696df37e8eb01df99658a7385f7ae9105afbc4821
font_02_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10812 bytes
SHA-256: 52352ed49f3f960b707985c5c469c31720bb533142164efa8ea44d912cf96f25

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