Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e0134699c94d06…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 03:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5e9178b4edab172d577a6e3b2c0b2ec SHA-1: caf6bcd7a4710200a50bc31965c083a6a6dbc6d9 SHA-256: 22e0134699c94d06892459ff857f00bfc989ce76619661f4a9470271b4a481c7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_SECURITY_BYPASS' suggests the document instructs the user to disable security software, a common tactic to evade detection and allow further malicious activity. The embedded URLs point to potentially compromised WordPress sites, likely serving as a distribution point for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://drafthe.ru/uplcv?utm_term=return+to+castle+wolfenstein+android+apk PDF link annotation
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/o7d96jtdpu5nbn2s1dfgdqor05/pirakibuvepapemivizu.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/11961671439.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/5118605636137e49934a64.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/donegewopozofadimejirutu.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/1185653867.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/wivuxodupawokov.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/78938903542.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/narurazinalex.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/26c9a5b0976def01b98b55aec6fd59f7/30403723619.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/62558102848.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/siminipe.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/80291702635.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/72420275391.pdfIn PDF document text
    • https://tckontrola.hr/files/ximutobixudijolotu.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/98123236793.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/53177989459.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/83598766246.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614241e13a0f5---77687837592.pdfIn PDF document text
    • http://live-net.it/file/82944724581.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/23804917925.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/32557898255.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/23707214169.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9f1fa0450f1b384299bf9bcd7c780251/pamowimuvonexa.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb5e5a1c1---zatimaladutetoxamixekesu.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/wekarujurowe.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/14079809291.pdfIn PDF document text
    • 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_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 10936 bytes
SHA-256: 1eb11a76d5cf62479b16bedb14688dfcc4ae08ba0657b410e6c1d516b50bb4e8
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 19440 bytes
SHA-256: 2709c9f448219571d2991cd9431a27403a716616aaf6a4e377e9ad021d654bf2

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