Malicious PDF — malware analysis report

Static analysis result for SHA-256 279282d6a529b9f4…

MALICIOUS

PDF

72.1 KB Created: 2021-07-17 07:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 280c88c569a0503a640bad84f137e259 SHA-1: e32203327e6c09b80d28f8b136406a11bb44bf80 SHA-256: 279282d6a529b9f4549eeb379369ea455aee627bd2e8f7c88b37bc607c2b3768
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites. This suggests a phishing or malware distribution scheme where the initial PDF acts as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gpmpoolandspa.com/ckfinder/userfiles/files/wapodexesulo.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815e788b640---pipuxutebugufovedad.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/19020921852.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/bd315788f8bb574af88f45a85dbca839/37123530237.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/jaxazewarumemasapijive.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/cfc403d4e59fd1fbd85289ea2178914a/kalutujijapuj.pdfIn PDF document text
    • http://maihome.hu/admin1/file/86841608202.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-14/20210714152251251208.pdfIn PDF document text
    • http://rayer.cn/d/files/jesijebekasun.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/jimupuzobotone.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/8347528850.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/50903135475.pdfIn PDF document text
    • https://activepymes.com/pub/file/vaxekowikozasulu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce1602e8---zupukesizewidibona.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/338298148dc72ecdb7d1dc3862b07185/30806784382.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/535447653608abe4c668ca.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/03cfb59feb5fef356a32c50f76d52c41/punejejulafefate.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tkgg9f7e75mi9iss4qoaii49vv/fovufof.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819dd96c8d0---dijeluzix.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a445568d00f---73859492520.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/pavijovivapapoxilujapageb.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/gorutupe.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c87e63ccc8fc455a3892670a623d9c13/64912725467.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/64389137496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=input+array+in+javaPDF 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_off0000baf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF2 15980 bytes
SHA-256: 30a4b8fc498b912148d7489bef03e894cc6d4faef1b2b853b13e18dc86d17e34
font_01_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 10140 bytes
SHA-256: 88c65118f6558548901b2179b3cec4a1cfa9ebc3fe17cc91451dec33b00afa06
font_02_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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