Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1669b8f70e83657…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 12:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bca91e62b754552ad1e1bc43abd93fde SHA-1: c6059c141624054b46fda4af50441535d9ae74bb SHA-256: c1669b8f70e83657d09bddaff2249aee9d18cde02ca20ba670139cd66b3bcff7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=ups+apc+cs+650+manual PDF link annotation
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b4f5ce941---92662270095.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/90598694827.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/0kk9184r4ljc6og2i70a0945m4/vamedejezanifijiwolisexo.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/nemikijumudomotusoxav.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101355920ceb---zegatanobidebefowaresudu.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/jowubelulozolawanoti.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/relepevivixulodirobona.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f35b6d855c482aca3a616c661f7cd109/28643760079.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/2482679218.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b69426c3e5b02a8993d924c4865458af/9562306275.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f2277c4c62817af75259306da989f39c/20852150523.pdfIn PDF document text
    • https://majubesar.com/contents//files/kezulamikotawukutatoripu.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/86335598771.pdfIn PDF document text
    • http://tcihk.com/userfiles/lebudejedalov.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/luzurotimeginizib.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/sj91uavop48t44vdj812pb3t0l/difakawakejejaneliz.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f6878e6a---sobolukaxerupax.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1fdc9ad0d---88404977050.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/4222952155.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/bezekodotufofuzazosano.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-13/20210813012059444730.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be48586daa0---84096829680.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/moladabokulefadegod.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_off0000c3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 17564 bytes
SHA-256: 8ace7b879ab0af575c95121a8721f06ebae979d116f93732d7fcaac7d27e6fd3
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 10524 bytes
SHA-256: d0ce3664e09b9f816c1e1f152d6994a9a167d7ffd92b602ade0cb657c54ccd19

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