Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef27c65582e6a81b…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 02:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 78bb213f4c9df456abdd55d2a46c41fa SHA-1: 37b8da6c65372d9ce7bce17d28976a559a036225 SHA-256: ef27c65582e6a81bd995e2909fc33a6619ad1ca5d02bd44fab5cf68bbc4acf64
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or hosted on disposable domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://webtechnocrats.com/upload/file/85962281483.pdf In PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a33a781648c562ea7dccb0c8620b194c/81884899628.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/82295119855.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/kujuvukoxenapedevid.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/9vaf3h7h40rlgavjn3c0kq77rd/vujipinavetovutelujisa.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/rafuzojolevugerutuwo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a5baf44b---gexopuvikalone.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/13110d57ca82361c838a99c3e0c20c88/66797761207.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908acad8d96---kabijasokebuworige.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xawapuwaxasu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fac599aeac625bd33e5a24d7f797ae7e/megafawotapofefe.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/kisafebelomexu.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/75145439247.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e24065e27---xeteka.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb5350db41---93165505223.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6588c843---5298529592.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d31e1583f9---72434445412.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c61d2c262cd---galuvedofug.pdfIn PDF document text
    • http://gptools.net/userfiles/file/93920430766.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/riradakevisovoro.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607701d0f0e2e---besojufefirijiriwese.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/pisubekezekanewinaxe.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c59f832073278241d302a1cbd1c36164/4690046978.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tsutg6bkmcuvp2htdq9lf43qu5/66894243801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=scrambled+eggs+in+bacon+greasePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/39415506762.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/rajig.pdfIn PDF document text
    • 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_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 10832 bytes
SHA-256: 52fbc15dc53fe7b6890025d428e47b0e37f453d2c35a1e2afc6a2a89f50b980e
font_01_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 16996 bytes
SHA-256: 00b198f6c8c7ed68b4a2a643260f8816b4faa3a00b9a554c41304e8dcd18637e