Malicious PDF — malware analysis report

Static analysis result for SHA-256 b278d6e82f40cd77…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 06:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1311d3beba936f2dcbbfbb818525e612 SHA-1: 8c70624934fb34ae36e8033d477d9d67ed3c0e98 SHA-256: b278d6e82f40cd7744fb44c591eecb9c0036216bd38fe166f84301a046a03049
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/dofit.pdf In PDF document text
    • http://thephinhmienbac.com/upload/files/dexozagebosekam.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2gfrgntfgtodcp0b9pfgf09hpd/kabovuwejuwuxuwix.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fe08ce609---vazozajafogolowogiwapubes.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608418b74d9cb---91256605054.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/mevirodabegadisodukosewam.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/acgsck507a0bev2qkvv8nmtl23/lesabofozalawenu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e328f437a7---xipemunemefosupe.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f18ca62d---xogezolakuwitaj.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a906281c33b---82959795749.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7289cb440---pazilefozasodiwoz.pdfIn PDF document text
    • http://valeneighbors.com/userimages/vatedisutusofu.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/72467587310.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d5d070c9a---xifuwojiwunuforaz.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fbc1a644eae2144915336658264d1185/50760454627.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612a24eb66751---85435936278.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/damed.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/41b7f06b3e3eb526e195615e151021a2/20064204370.pdfIn PDF document text
    • http://novichiha.ru/pic/file/39070264496.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/sinapalujigewezidororivi.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/jufabojatotokagofa.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wazaxetepen.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/64203424563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dubin+ekg+interpretation+pdfPDF 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_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 18024 bytes
SHA-256: 841113612c4a1f3ff082d6840f219d336947c00b7b2f4aa16e6ac0b9a2d0a7fc
font_01_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 10792 bytes
SHA-256: bb35aa2a9b6f333ab087ceed88c61859afa431b7e946bd729ab928262d16e7cb
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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