Malicious PDF — malware analysis report

Static analysis result for SHA-256 2120a7773171a1ce…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 15:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 637147b8303577b43154249fe752de7d SHA-1: e838ceeea2907386ee71a793e92b10a2dbdaa88e SHA-256: 2120a7773171a1ce98309f0789230cc72754c4e5b3da7a6a159c2b9b1db4ee7d
164 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'download button' heuristic further suggests a lure for users to click and download potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jiangsutravel.kr/userfiles/files/20210812_015756.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/11842367377.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/79507710613.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/xodolireno.pdfIn PDF document text
    • http://www.emailposte.com/pictures/gojagiga.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/fedanejurolafinejiz.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xukinefubefogomine.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c4c43dd---fominivimisoni.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e099e0d8cc---rosuwigewetuvuxakeso.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345b369b33---50891167769.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/dufiraterakenufoweribin.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e32653da24---81911495187.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/gagolekima.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b85957fe---44559748881.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/bded290cb4e1c5c4fab57371ae04b6fd/72942272482.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbded293459---perasosakakodomugebadov.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/19336iblk85up4c8l2mqgmdi0p/doweginedawexoxusalesufeg.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eda47f99b---xegafedamejuso.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/20271100732.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9559725b1---10618087788.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/9351726152.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/78821303446.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/pedotexivolewibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=s%C3%A1ch+b%C3%A0i+t%E1%BA%ADp+ti%E1%BA%BFng+anh+7+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A2 16144 bytes
SHA-256: a2794e832b191cab2e9f44eeb57154fbcca8cc038880a6b8014900bfc05a8c94
font_01_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 11376 bytes
SHA-256: f87085d62a8f2da1cedf38c9eafb8e490cb8194f4509da12902338ed1669a7e8
font_03_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 27828 bytes
SHA-256: 8695e200bbdec9289631c3f54d504243d77e82aa6aaacaf76aaad8b905f22a24

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