Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff498bc8a1f5809…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 00:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7270d94d37797f4c3a602995cb27edc SHA-1: dbd84e1ed567d4b3ff73f20195da001db19c11b9 SHA-256: 2ff498bc8a1f580912c809c861632e5519d602d35dc22c68a622f3d8bca5d3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan suggest it likely serves as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://culturasiapamplona.com/guiarte_userfiles/files/nidoxufomegal.pdf In PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/meburakabolaru.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawurezufafijogixizuva.pdfIn PDF document text
    • http://kbchina.de/upload/54809239794.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c541f20f---84955545062.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071d90bcbdf7---wigapinoravoxelagajinuzu.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/26813073257.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/67765394636.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/kukebipamilezivote.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/44982020329.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9f7a33b057fe5b870c518e9db63b5782/74650106396.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/38884532689.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/51682438427.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1ebd95e19b1422355769a17b6cd3fc08/gizikazigufapiwutozani.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/zezakobi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e205841---62491942536.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tifebutipiteku.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9daa9bedd---37601611127.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/95519833643.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/62060093632.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/17/file/99917072210.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ca353e5021c0a2eab85200bf1321b8f7/gexepepakibitewafoxitovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=uncountable+noun+worksheets+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 17436 bytes
SHA-256: d66d7a2e651798b290bbbf9f509049dda023b8939d4879c90d0249dfc4fbab44
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 11052 bytes
SHA-256: 4c12f5f76fba28953708191b879dd568821e3a7e0c6d7189f03de7bdd75af649
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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