Malicious PDF — malware analysis report

Static analysis result for SHA-256 142d3c20e3969293…

MALICIOUS

PDF

94.9 KB Created: 2021-07-06 23:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 322f11617bf9c91f342c5652cc820100 SHA-1: e36643223d773b5617b1ee8fdb89ccc0906fd88e SHA-256: 142d3c20e39692938767ff8e22cfadaf4087bb67752fea403e7aad3915f00e4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=how+to+do+a+back+walkover+at+home PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/97893152718.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0af1d72125fb7a0e264981d6cb1b7073/donixo.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/1ef3437edb9c342c95ca25493f9de049/10641020127.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8a258a82d1b2ba5c998ffd77fbbc4e17/kixuj.pdfIn PDF document text
    • http://muszempilla.com/files/file/gusijavofi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fp80btrfifuteodo8i5iohveht/wemisatotidedi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a4aee3f039ec2a91f8cb9562c29cf4f/92621331276.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad30ecefa2b---58518828345.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/mofivoliwi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad6058e41---31124980248.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/98ab6db69e0aa833cbc8be6812e0e9a8/21890925983.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/9097318836.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/judedakajafokatare.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/varugisodobirudi.pdfIn PDF document text
    • https://motacademy.it/file/sobubezoj.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/vnql8k8dqp6rt97n95srvn390o/44269576505.pdfIn PDF document text
    • https://cargotavio.ru/files/file/72965044418.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/32404818a21f0a50f157f873671029d1/kogumipubokowesev.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/1145921464.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f1384b06---33668064605.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/8310894406.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a40896085a0---tuduwuzeteziwijasutuzoxox.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0d43175ff1898dcd3ea766c34cbc5a53/17045032522.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacb5888a4---83375969913.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 16528 bytes
SHA-256: 691fd5e6eaa9f8b726a262ef4b87fe5184a9980262fa06fdc2a66814236d025e
font_01_sfnt_off0001260a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260A 10644 bytes
SHA-256: 03d9c96ad2e279873f9384cd509936f0442c41de6cdd93a1ca382c4ba746d766
font_02_sfnt_off00013e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15686 16240 bytes
SHA-256: 5b88b971b18ef57378f111bb1a6cefd11746671530c65ce1d5e6ce58b25a34ed