Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1031a7201d0d03…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 04:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7a987c5636d5fae68f1e56f00886204 SHA-1: 3dc3105a6457f1aefad3fbc72ed49343f5df4c5a SHA-256: 5a1031a7201d0d03f38b3de8c597d84cf47e6acb3f5e2a71d4cdf503bf001e67
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yoimart.com/upload/file/20210907193203.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78595c185---detemosiw.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/bikososafetet.pdfIn PDF document text
    • https://breedlife.com/upload/files/49445582305.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/25370213222.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/96679181035.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/dopuxarunuzorajota.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/66649336423.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/7630585304.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/56950041990.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/jufawapiguxugobulufapi.pdfIn PDF document text
    • http://tianfonmm.com/d/files/xibejusixatepotozamoximow.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/lorekulam.pdfIn PDF document text
    • http://byecook.com/ckupload/files/20211656245.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/wiwuduponulenedifu.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/74764821159.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1474c0b87---kagigagutozafujeveg.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/34788441722.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/93294741892.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/56244175859.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/95022825850.pdfIn PDF document text
    • https://fasleh.net/Files/files/vatelikitavuxobuz.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/bijixetaliroginoduxuguluz.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/sokofalasoxulo.pdfIn PDF document text
    • https://titishop.co/upload/files/rabak.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/15677476294.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161362592daeb9---1785179423.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d596397c---11688065648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+zombie+catchers+mod+apk+unlimited+plutonium+and+moneyPDF 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_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 11372 bytes
SHA-256: f296428670be9e3da5eba2b699504d6323b4e6fede74e87e429b891514083786
font_01_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 17084 bytes
SHA-256: 40d414112cde3b81988ca37050c12fcd6e909323c97920121e4ccda43c0d19d2
font_02_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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