Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2c34845fef686b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-30 14:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83a0c8a7e416d234297cdd06e5ffbf9a SHA-1: bf6849035e60f4929b9eb9eb7a49925c997176e7 SHA-256: fb2c34845fef686b2f74a00c6b81af341c20daaf39a794a66040439e7e083004
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs, such as http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151e8940c990---dajomulimad.pdf and http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laluxelo.pdf, are likely part of this malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laluxelo.pdf In PDF document text
    • http://thewesternmist.com/userfiles/file/19633520042.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151e8940c990---dajomulimad.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/levobuto.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/15583167206.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/busomupoxobibalexi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b77584a828---gutevawowowugiwupajimavej.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070552437636.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/80141296851.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/1408598738.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/81578641059.pdfIn PDF document text
    • https://eniedu.com/data/file/20210927030839.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/suxirisoxipora.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/kakova.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210906021748.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/fadodenilujavakavule.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/71067802343.pdfIn PDF document text
    • https://somogyplusz.hu/files/47290499277.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210906233429_tgs52s.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/31112886357.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/188f7950cc64609ca68e1af625c574d3/46877663112.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/jusur.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd1d86d7d---nuziwinavopedapof.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/6515978117.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143124a89a5f---tulupijoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=new+redeem+code+for+genshin+impactPDF 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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 18660 bytes
SHA-256: 5491c85adf327e9a4b994110783270bca7b8eae92bab9f2ec79cab09cd49f1be
font_02_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 17332 bytes
SHA-256: 8140a30e949a8f7aeb4b509473ba019a24989328d48e982d6d0c17708e467658
font_03_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 11084 bytes
SHA-256: c7627d2100a74813da18cb96ce739f0c70d558f48bdda8c0cee2eb8518de6354

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