Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e4e1dbd9f989a1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 20:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98f3364e33407d29c73f4a724d8f9101 SHA-1: cd9257bd3a65c8a324a6c44d9c2bb51ff2226ae3 SHA-256: e9e4e1dbd9f989a1d8e4eb1237b968e80f6b13ade78dad52f0f0127d60521064
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/dogudexazewedeluxorakasa.pdf In PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f6a8e659---18269970557.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb30c4df53---68646237871.pdfIn PDF document text
    • https://morabia.fi/images/file/ruwewusazokawipupebud.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/fujavevenu.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/tupavunig.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/bavubiretozoveputuxukeki.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210729_230610.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/rejuwugejotolavalikiz.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/6dcd6402ddb736dfd51ab07e38529f06/tisodukudolenasi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee31852d5---98101034671.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8967a9426f2147a2196351d90bb9dcd6/66112029254.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8eba6b31---dejovuraxovimudugobozivop.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/59855731533.pdfIn PDF document text
    • https://hojoairport.com/images/file/6645712186.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/93160928837.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/72955210775.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/feminoludifedevozir.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/dijajelunarumum.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/dd1oq8bhbtan6ud82db5p6dqu2/56593489685.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/13124820099.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210720104643.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/05/file/20210705_031246_160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=subjunctive+in+adjective+clauses+worksheetsPDF 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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 11156 bytes
SHA-256: ea9085eb6604b6f361a0ca5d00941256d5a2449c196383e4c32a9666c971c627
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 20508 bytes
SHA-256: 0b58bef1cb79b4969cad84192f3ae5f05f43f429a00c471b5fde913e4fcaf458

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