Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c43dca052417fec…

MALICIOUS

PDF

87.8 KB Created: 2021-07-16 02:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71cf116e0594277cea5f5472089996a8 SHA-1: f656d7d3aa5ce247b7f2da1f7e143c36d465bdac SHA-256: 7c43dca052417fecee3ef3f3705053a2b3460a29e13f5df3f974708264f23b93
156 Risk Score

Malware Insights

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

This PDF 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 URLs pointing to compromised CMS upload directories, suggesting it's used to distribute phishing content or further malware. The presence of multiple links on disposable hosting and compromised WordPress sites reinforces this assessment.

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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/crvhm1se8jqg6fqkoacmnfumo6/98856909831.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eb63697caeed6c37871bd879d657ffe8/puxigovuwaf.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a6e1e91b2---nafiropoz.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed29d4eed4---bolewawigeduloful.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/supumubuwunol.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829bbeab367---61209042910.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bd4200d176653ff0b6d15d07273e64d9/danotinopov.pdf
    • http://allprintusa.com/admin/images/file/zepinasonuxovakiwitaxu.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/53585059012.pdf
    • http://pc75.net/upfiles/file/1626097121.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b72acc069---xaxinurezujazilorupumes.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cbac03664f052ad22af1ec47c5f45c53/tavokonolusali.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/zufonow.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078370aacb64---vasetepiruwag.pdf
    • http://majorpropertygroup.com/userfiles/files/pepapegun.pdf
    • http://arniestribu.com/campannas/file/54086029593.pdf
    • https://addsfly.com/userfiles/file/96486204661.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05cc047c2---xujekuzigozetemuvegamunal.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b10653168f8---modagixu.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/725a19c6032183df5bd7d905b050fba7/63174429904.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428212648901585.pdf
    • https://aslimitada.com/userfiles/file/mapise.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098fd69345d8---69447669617.pdf
    • https://samarpanbharat.org/trila/userfiles/file/2526347677.pdf
    • http://dongphuctqueen.com/upload/files/rojazot.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a426b7f4061---nupegumowetuzabimiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dhoom+3+full+movie+download+dvd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f378.bin
3aaa072be6a5424b86f31b160fd8d887409469a140ad0df8da516254df29aa4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 10676 bytes
font_01_sfnt_off00010bc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 16792 bytes
font_02_sfnt_off000123d7.bin
3452f332c9290a973b68b1491799d98d05fa52e9d88a8f6a1d4f322f358122d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 17560 bytes