Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e94853f44a51ce5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 17:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e8f0caab17594b9f53b1827faa57634 SHA-1: 8bf0ac8751b679d525fb7619763f9efff18217a3 SHA-256: 0e94853f44a51ce5c6eb69e9a5b7dfcca3d2ff38f3dfdf3a6bbb15d04553ca9e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised or disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external links and the high confidence score point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dabaizhongxue.com/upload_fck/file/2021-5-20/20210520195349214008.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b540ae5d327---44951767638.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/13323538068.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc32d2045---zoxirajalugenepukuwe.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/kegotupulujajisa.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479121e606---59058587419.pdfIn PDF document text
    • https://arerp.kr/data/file///1340230631.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/57930674896.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/muzivazuborasifevugoki.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fbfa6cde9---jibasavusegelagoxejusa.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/fuduke.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b34e10b2cfc---24964776003.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc7bda6007---90520958379.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4dcba4c4c55359a51fb2b99defbcb94e/41973351147.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/sajokaroravovetazujix.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/bamizoxetekesipedutab.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/75326818721.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d6d697301f9a1d842eedcaede7945775/zapokuxivufiba.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6gv02u1bop9rtprqbdr0qku4nt/3191009618.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/sosoxadokagawa.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/75219575568.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/55056365958.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/salixadiriz.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/96930793928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=employee+termination+letter+templatePDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 17520 bytes
SHA-256: eec7e2abcbb6bf2d5de160469e72a2f8a014fa5b6156ada4f04de4babefcb5bd
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 10344 bytes
SHA-256: 016211b9ee5e76dc377a093daafe45d40c4850a41326a790763935d7defb715d

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