Malicious PDF — malware analysis report

Static analysis result for SHA-256 760a5e106ef2d83f…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 14:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efd8608151846d649d54808436d26353 SHA-1: f6fe97042ce68b918659365f17725941b772547e SHA-256: 760a5e106ef2d83fae8223f53b4eac3dd0f5e4ff10dc220a2a5484730fa7fc30
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to host or distribute malicious files. The presence of these links indicates an attempt to lure users into downloading further malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://marathon-gexin.com/Uploadfiles/files/2393766529.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e94b5992b6e449ed8c31d18e9fdf7eca/puzufekadupomevanoxobe.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/12159848429.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa686ac54b---37254336939.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/vizejakanajewali.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/44449366031.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a631f783---8031577936.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nafepagibilatirogo.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/sakatijuserofutaronoda.pdfIn PDF document text
    • http://esejsc.com/upload/files/nosisexefogidegumed.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2a134c59---bezoxativemasawejonifo.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/k5legns2t99fq2vtj8fqkaip8d/toburowomuxijisutemunuxa.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083de6315860---34142919403.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/4972083415.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986329cb8dd---pimiwaruxoponijajeve.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c592829ab50---94130920506.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/61997369793.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/ziposuwunegabanusodexubo.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/24865265715.pdfIn PDF document text
    • http://webursitet.org/Files/file/gawapubusu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/27904e9619de3d978081eab749aa83d2/87041736431.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/75296215685.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3807b98f5c---46673005791.pdfIn PDF document text
    • https://netpage.info/userfiles/file/xewar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+dawn+of+titans+latest+mod+apkPDF 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_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 17732 bytes
SHA-256: 7108fa411eaae66dec177d2553949af2422248001ce9bf561f26f99cf8e146cc
font_01_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 10736 bytes
SHA-256: 23f83dc8a28b32c05fb70e668b74d39912b43e2ae10add2fbef449c118d512eb
font_02_sfnt_off00013f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1