Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecddb8d1f206ca6…

MALICIOUS

PDF

79.2 KB Created: 2021-08-28 11:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc98da42f6c57097af184602c4df2aef SHA-1: 81e740edb45f07ff0e469516a6e745b06151f875 SHA-256: 0ecddb8d1f206ca6c7e88da1dbb448d91bccbf7fd8b42afe9bf582343c044374
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=stainless+steel+with+little+carbon+and+no+nickel+are+called PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o6hlaofusr5opehhjgrcdsfe84/gorej.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/91683193974.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/rejajanobofotawavisowa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/89knqd2md45oca2g2mpcp2cbg2/52423851256.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/79141665368.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16101332bd1413---muvijadanijirak.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/53fab005eba56177833aa4d3fd5c8ac4/51429449446.pdfIn PDF document text
    • http://fruitvita.com/files/files/podabatanale.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/zejivufasiwipuzewotuf.pdfIn PDF document text
    • https://activepymes.com/pub/file/rigamebitijopa.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/88bba16566a4768842e081bd42d625da/42938515151.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/sajepikezewunuvo.pdfIn PDF document text
    • http://sushi-belovo.ru/files/punupowodimanipav.pdfIn PDF document text
    • http://www.520amis.com/upload/files/90994198634.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/466878184.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/85111141177.pdfIn PDF document text
    • https://windsbs.biz/files/file/50672919349.pdfIn PDF document text
    • https://ksboutlet.com/file/files/guxivivotil.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c78aa520c256bc94cee70f15f1dee865/vifonuwadovu.pdfIn PDF document text
    • https://semut73.com/contents/files/504250646.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/ferefudejosunixusep.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_off0000d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 10860 bytes
SHA-256: 089f0ded9014cfa8b3ca4efce8c2c487513b5b9ac0f88c25c393f755c40f3856
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 17312 bytes
SHA-256: 254f6f53e069c9f07a171902dbd4534bac7738034f0df80208a3604e0654132e

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