Malicious PDF — malware analysis report

Static analysis result for SHA-256 271fd2436e6fcd03…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 17:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8ba5a443632bd7641aef7875aa51a33 SHA-1: 9c31bd33209f55c410ee19fc1b73502d34485ccd SHA-256: 271fd2436e6fcd03fe4fb66d438adbd9ad079d0eedf56d802f3a63f41f7842df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

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://digireg.com/upload/tiwotojimotafex.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gofozol.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5611d7c8c4f19a8b8e2f9cab895a5827/16197622591.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/3250061914.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/depive.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/4796483371.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/bedajobawewivubivu.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/palaxirexadeku.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/40e240ca3f4ea01bd78a111e82f89f65/34698815783.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/ckpgbcocm7dctfecil0n9h6s44/visasajovolexebut.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/9subp052pcm4om3nf456gvbs24/60607451326.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/wazezejamimi.pdfIn PDF document text
    • http://tencanpowder.com/d/files/paganepanib.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/6978371866.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/72071699471.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a3548f66eaa---wotezujuwapuzufopa.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/58988933199.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/33475e7ef5271c2deebb8c883628a34a/vavarumezoriletekimo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1823ef14486b490c5cc500431759b746/53722062204.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/22822643621.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/83624238373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=solutions+b1+student%27s+book+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fea5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFEA5 16804 bytes
SHA-256: 452893b078f1085c55a3b66b8c1389960b6c2f64c53f3c0dc0d36824b896a151
font_00_sfnt_off0000c619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC619 22596 bytes
SHA-256: ed061215b4c552832f8b18558c63286e67fa89d6adc5e2ebdc2eac55f908507b
font_02_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 10724 bytes
SHA-256: 693d0ee88fe7ad819f438ffbf89ab382f1bbcd5515d515cb1b70f5e670ecef21
font_03_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001473b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473B 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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