Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aa14a7f8a523ae…

MALICIOUS

PDF

81.7 KB Created: 2021-07-20 12:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7dc0395b4be8e58aa3e6f6b11b608e94 SHA-1: 3b5e3f030e49bf14ae2635e3e202a22cbf21b29f SHA-256: a1aa14a7f8a523ae6e942ba3cdfa637850e1aa79e8f15f656d6b2ec1defa597b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721faae5032---86468147065.pdf In PDF document text
    • http://kelvista.lt/images/files/kanezudesasedelu.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/sowipanimutimames.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9273878f956680733c15ebc5c342dad8/sabasomejulefiwu.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/12651363813.pdfIn PDF document text
    • https://migger.dk/userimages/file/ruvomapofuzibafedijibinin.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210627_A02F2B78735D79D4.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c45fc73c9---963275081.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/95280988357.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/68152544970.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4fb8bdaa---52225392251.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/93741308368.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/vumutovomaxame.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a56e845d63667e90bb0346363b815a6d/lodawa.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/e6n0e024i7536thojo656gu76n/bopemafodo.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/1sh3f80g26h3u3ql3emh2kbf8e/tativakoposisowazut.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/27bq8j216eliigpbj7olen6nc0/jemekem.pdfIn PDF document text
    • http://beiks.info/public/file/1654467666.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/milesalufirefiwuz.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/pasasedenekoxage.pdfIn PDF document text
    • https://etimes.mn/uploads/files/35512365153.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/20326050176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=445mm+to+inchesPDF 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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16456 bytes
SHA-256: 22e0de0fe898b3ef819c4f23c634caf979d4eb6b783358e7be26637536750b7f
font_01_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 10300 bytes
SHA-256: cf41204bad22c37e61cbbb8ab05417752a31552310c7d2235f5eef040bf2753f

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