Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ac3a12b5583b94…

MALICIOUS

PDF

90.6 KB Created: 2021-07-14 04:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99a2678c588ba9fa1fd3c3a14a4bb37d SHA-1: b40f01143ff5f1ebf7bbc6d08fa919db081816af SHA-256: 47ac3a12b5583b94374be2d91a4fee5c4d535d766a5a608bc0acd148d3ecaef8
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 upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://viquadro.com/userfiles/files/93200486742.pdf In PDF document text
    • http://abpaluso.com/upload/file/bavubefidanak.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/64552611317.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fef31cdf---zanaxobavoxijaliseki.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/bufakalusimakilonalefoxa.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ka79e8e8gr3csrmt92jad0jomm/novumuverur.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63b6e0e16---76635321748.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34358b88f---lijenozanavevurobufotidol.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608883b81105a---27387702022.pdfIn PDF document text
    • https://go2germany.ru/files/file/34129920588.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/puwoxi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/53860005614.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rezobajewatilufovizidixa.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/21648178960.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/bozufakesafugogopab.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/84403831474.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503072431402420.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/joregajepoximerewexozasi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/128fe6ea89c208b430fbbe76f20aabfb/voxubasufiboji.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/miboserigikagok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+baker+and+the+beauty+cancelledPDF 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_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 10496 bytes
SHA-256: 5a4298b0b8bf43b06e0ae14b57d2bc7120b2d358e1c31e05abce0a60413d01a0
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 17676 bytes
SHA-256: 4d33697137a8a161e6ea9b47fe0f376d163849a422404cf0c9529eda714b3104