Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff62e598c92c1a9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 08:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8edbca90953f5ec52dfe9c5de3cbf9b9 SHA-1: a7bc1a62351a0ad7b8408b8a14d62beaf2a44719 SHA-256: 7ff62e598c92c1a938dd1b70e3482c66a40228d584176e425a1b958964e7457c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The PDF's structure and the presence of multiple external links strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cihangirhotel.com/upload/ckfinder/files/gakuvav.pdf In PDF document text
    • https://digireg.nz/upload/43208670420.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/92622360749.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/35453448294.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/kipalidelezejiwov.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/16426741715.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/luwosevuwufamamebotekalon.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/dusorasalidofegevufufu.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/wizisuzoteladefosenu.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/xedepepatob.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/42739426206.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/wemefe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160decbc7044d1---ridelofujopetedewujijaje.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/23f607a8265d004aa85b186fb1be66a7/77602554699.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fq5htp2oq1r1u4hhbs5q2rlrmk/13803950478.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/68255329733.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160803aede2da1---zosozitofu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160793e57d252a---lojam.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/3588314384.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/guvojuvatukudejeg.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/solilanigowevolexewo.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/sidedelaxediremerun.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf790e047---domigupiworagotog.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/5903496347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=a+gas+is+compressed+isothermally+to+half+its+initial+volumePDF 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_off0000bbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE0 11328 bytes
SHA-256: 60495f63c1a8df68c727c0b8f9813a732700b1aebd91dcb412f9a46013d260e2
font_01_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 15712 bytes
SHA-256: 839827f75507785777a436d8c513802726bd2e0becd7a272f372cade49ec1863
font_02_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1