Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f36ae73a44dcda…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 13:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d752acccaf388d5aea75daf9087c6f81 SHA-1: a82e669a23904b09cfd0a2471ff5701a9ec5f7cc SHA-256: e1f36ae73a44dcdae4c0622f2b3ca0e6d30944f307f26a87d7a48c0bb8ccd7c6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://chcial.ru/uplcv?utm_term=bajirao+mastani+movie+download+720p PDF link annotation
    • https://securitydm.net/slicice/file/77727113313.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/20667648801.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/50172760604.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/nobamorag.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/xaxajukofizajawifagiv.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/libelutexanawam.pdfIn PDF document text
    • http://nincity.de/inline/file/6429916898.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4b1938fc---xuvasepiremaginob.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/18335839229.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/50151194261.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/pejatejevuxo.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/zesatumoxed.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pikegumajerodap.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/31953934477.pdfIn PDF document text
    • http://royalgroup.at/tmp/xolokadajudagef.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95741115715.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/penamagu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0378b871---10571632464.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0a1b4bf688f5f6c760599505c7ca5c23/belotifamobagaruduk.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/94268300725.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/83794447223.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/71063241506.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/24017124088.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090822085070.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210911_E51771E7F1F7C649.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/64303761778.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/vipebamewosomuj.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55f61120a---lalunurodizo.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_off0000cd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD21 11180 bytes
SHA-256: e0b7ca7bcf1c11f099aec9b586b11db755630250066f80bc8024ed5362f40565
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 18708 bytes
SHA-256: 111b2b8500626048f4bb53a4f9fe830935170da2f935d6e27f9724d33c070c49
font_02_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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