Malicious PDF — malware analysis report

Static analysis result for SHA-256 52218250bbaa7de7…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 20:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31d3d0626df57b86a891a82335df080e SHA-1: 6c7e8006ac21790af3382d37f4591a81bf6f166e SHA-256: 52218250bbaa7de7a4cc05c47f8b0a54f2c711a069d543d838244d4daa6a9fb9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a749694bb81---metazomafidukafuwe.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/betorunimukenadawepavitof.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e881c0e3dc183a69cc6d8cc9c744270d/matumibadapimufoniloma.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5c893520f3a5817bb0f069fd95c2e3e8/64081861159.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091091bb165c---52048862243.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/98031796682.pdfIn PDF document text
    • http://learningkey.org/userfiles/bizomodekasugosoxa.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/47773039194.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58e44e4d6---51302912311.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/09492c9b1eefdcb6b9333469540ac5a3/bexiguvuvapemobuji.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/27261094495.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/2836686358.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/dadonet.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/vl0npud06h38uqformofc94k3j/71600364611.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/nesojafevubure.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5237dd97f---11139299585.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/31979458738.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/610151d17ccc773032b799bccda96b6d/10284612423.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f371b62020---65315750706.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/34026006465.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ed7cdfc0---jaxodotol.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/mekawelupagefifuxesame.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ce53bc39edc---dimozojesoxegusesibolulox.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d42b359c1d896bd971365035a79ca215/kasararor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=alvin+and+the+chipmunks+tamil+dubbedPDF 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
stream_002_off0000c7a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC7A1 18348 bytes
SHA-256: b960c886276dc303b2cd674f7f71abdd22a968285cdb587b18ae7858bbf04612
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 10936 bytes
SHA-256: 7a7c2f97075edc0e37b900be9d15a7180340b6662e4044247ec34913da2edf3d
font_03_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 18184 bytes
SHA-256: f4fc69b61d9fa5ded0844cdcf477958b3da25c42e62970d0c6a68e361286acda

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