Malicious PDF — malware analysis report

Static analysis result for SHA-256 b075eb9274a89a37…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 14:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22954d48719ca9ac5d9ff3c15724043f SHA-1: 047027c0ea392fbe007c9998bcbe9e632dffa10f SHA-256: b075eb9274a89a375096f383209536f420ad3e77277e26d7ed64aeee0f60e930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to external websites, some hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://beaszemin.com/files/fokefofozuzifitibunivoton.pdf In PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b917ca8dd1---selikebo.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/81819397670.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/gemawaravoralumeki.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/74568435373.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/runixekugimabasuvi.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/821312508.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kunenilutujijapitiruxi.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/jeriworuk.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/87962715288.pdfIn PDF document text
    • http://www.moyekolodin.com/files/6234054562.pdfIn PDF document text
    • http://uco-kampen.com/media/files/50894797467.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/a537vuhemogifd2ev9mgt89531/jaraxibub.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fb591c9df5fa00bce655fadfe14f38be/gokazovudo.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/viselugawoxaxinekoxarez.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/zebivedomazunabumeza.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/28152658407.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02b695c8d---21544337003.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/85387220462.pdfIn PDF document text
    • https://digireg.dk/upload/lusofufoxirawotitugejama.pdfIn PDF document text
    • http://0953057778.kad.tw/kads/ckfinder/userfiles/files/92486563106.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/76477108203.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/davevim.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zukiwubevagexezagadofame.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/zodoxalizav.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/gakejovewinebubum.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jaguso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+auto+2020+downloadPDF 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_off0000b529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB529 16364 bytes
SHA-256: 7f1d52402e26299b6d3e82594287d72276056b25d6c51b8f4f066e5049048b83
font_01_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 10348 bytes
SHA-256: f7b8b7d3c003a323f30e79239772e3e45df7b92d5ab690b93bd8caf7b7193c2e
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1