Malicious PDF — malware analysis report

Static analysis result for SHA-256 91115f9c87fda1eb…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 19:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 25011a37e2be9c313e197b7e4de2487b SHA-1: 74d71adeafcc7a42228316bb6ad8707a4fde06ac SHA-256: 91115f9c87fda1eb1d312cbb9cc1fe174c3d87eef3c139ad0c399fa2c6958fc7
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains. The presence of numerous URLs, many pointing to PDF files hosted on various domains, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=almsdeeds+in+the+bible PDF link annotation
    • https://alamansyria.com/userfiles/file/limibokunulof.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/81058784881.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/dabuxoderejujemupax.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde749d7f---26108244499.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/73015135055.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/fopibuwegakikijiz.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/95556321706.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146a07d91385---88989533220.pdfIn PDF document text
    • https://everestart.com/images/stories/file/21806592834.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/rolajapimulekuraginesirup.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/97024094180.pdfIn PDF document text
    • http://ccadl.com/files/20210926184524.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615994192f9ee---28053878817.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/888e2f8a1d9704475a9cb70deb710449/pujemavisinif.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/96489630730.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/83032608906.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/39962195704.pdfIn PDF document text
    • https://trystsalonri.com/images/file/nataxutapipamogasi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8eb7a5278---kefamuxuwubapa.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fifujutugul.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/pemeni.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/febetanerupe.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/fivikubar.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/70962326477.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/nasivilib.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_off0000b48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48D 10252 bytes
SHA-256: 434ee31fd74808a04892e0320784ddefa4a21d4d6e4e35a7c89dc858cb16767d
font_01_sfnt_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 16052 bytes
SHA-256: b39341c22a01cb3724b8ce1d27952a952dd69975478c041ac382435f029b1052
font_02_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1