Malicious PDF — malware analysis report

Static analysis result for SHA-256 68799bc0433cbaae…

MALICIOUS

PDF

87.8 KB Created: 2021-07-21 06:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8530031118d288d7bbff1567cbc78da5 SHA-1: a131b90f65d1d659894d6aced7102f1fae938aee SHA-256: 68799bc0433cbaaea50bf0534d6b4853f296220a4a2bbe6ed05341166de27034
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://reunionclass.com/clients/7469/File/pewaditirarofizilo.pdf In PDF document text
    • http://nyett.hk/uploads/news/files/rolinubilojovosa.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/sijapulu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098e2da808ba---18067106315.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/notanamatokesaluji.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/mapaxegokepe.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/6f66c01edc01f4c5efc295080af2f841/38144136512.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/ratobep.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/21846646094.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb48b257d4---nogogojenutomoremivopumo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb4f297f81---ganoturelegoxajedasow.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3774dd017be22290f3c9bc1a2939b20f/40308686182.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/12643153185.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/70323795682.pdfIn PDF document text
    • https://aspirans.com/files/file/tabugugolavev.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e102fb5e---lejuvetufaduxazemuzatak.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a343167fd85---1277090200.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/pabosasujinedimubonol.pdfIn PDF document text
    • http://kodemari.info/data/files/14438118012.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/30jg5399p15boa2ago8c1lse95/vimorovonasututibajudoto.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/71059667902.pdfIn PDF document text
    • http://elmaryapi.com/ckfinder/userfiles/files/4161916355.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f9172e15---gogekitibanugujijidivomit.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/82964345578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=letter+for+donation+request+samplePDF 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_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 16696 bytes
SHA-256: a7dd9dcb749c78cc64f3eb25236cd814a947f1455532d467c11d1b2c76827ccd
font_01_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 10864 bytes
SHA-256: 4083fc1640324ac02773a94e03636f649720a851a67f01606de2875f4d4a8ce6
font_02_sfnt_off00013845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1