Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e55d79f4063e09…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 19:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2433ef0a5f7338a103cdaf3cc583d0a4 SHA-1: 44791d013d4327d97341131a08ebd01f3ac355d3 SHA-256: 09e55d79f4063e09bd01561e4837fd499b6ba0dccef1f6e52e5e12cb17e45951
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports this. No scripts were extracted, but the overall structure points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/nupuwamojifibobu.pdf In PDF document text
    • http://progetec.org/userfiles/files/zumixatelewijivemitimufag.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/12e4254ea3908c5f7dad409c2569947f/tulegefotemoxopudex.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090722551460.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/ramoje.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/6632261809.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/43482558425.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/65378288189.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/wesakuburenaxidor.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/74887025407.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3dr59j7hprkgn9qgfp82234dij/97911167093.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210913161142_u00ihh.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/savuf.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/76960720082.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090213573070554.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/33242546409.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefipaxorofuzuvo.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/konakixubexanafigupedori.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14328ecc6---65058207844.pdfIn PDF document text
    • https://buyafranchise.org/files/files/fakalegogiv.pdfIn PDF document text
    • https://granitnet.hu/editor_up/13036775097.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/31484628884.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/27270904457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=joox+unlimited+vip+apkPDF 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_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 18488 bytes
SHA-256: a3307d26a0bfc1188374ffd267ff0f8b176a67952f842e4a47794f5fba92438f
font_01_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 10636 bytes
SHA-256: cf516342410b66764046e811347f2f0e70bc01b44bfd58ac49f19dc1ce6d0553

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