Malicious PDF — malware analysis report

Static analysis result for SHA-256 736fab3e696e432e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 15:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65e210080cec5bf7236750b8bca2b24f SHA-1: 05943a1916d7be664b198805cafa4eecbb62714b SHA-256: 736fab3e696e432e14869c3d7503ff4ea97957fc59b0b950e7df623aba617716
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to direct users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=word+formation+exercises+online PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820994bc92---komix.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/nogot.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/45991736798.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/49652429770.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/91714322102.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/nalofemirazod.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/85655404087.pdfIn PDF document text
    • http://www.toptehnik.si/images/81407325732.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/91558513661.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd087443bb---3503307066.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/3955018601.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/051014292297.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/5075684681.pdfIn PDF document text
    • http://candientushinko.com/images/file/pibor.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/779c0cec817806797d5440d67ca29cc6/93367541504.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/90288282573.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/1352689103.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613464f859614---66323565486.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/mawol.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/37077374502.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/zijifufujoxiwaw.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/bonavotoluduferufif.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/24pvbi4574hifsslla8fubh5i4/87389673568.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozuj.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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 10732 bytes
SHA-256: e6cb6797b1c78d4f5b98b1c4696fc7d2f14a33e32818a9d007cb9ebc8d6159f4
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 16568 bytes
SHA-256: 82500512dc1e4637347a6da213a720f3fcab4820f713e5aa7aa8282ebbdb80d7
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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