Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c23c8724bfe0e41…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 17:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dddfcce0ff5868e12ea34befef5aac63 SHA-1: bba356216cab44d8c11106eda95b6441f1ddfd46 SHA-256: 1c23c8724bfe0e412de238c4d85b5f93b68c90dfeec3fa0afe312041a574937b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs, many pointing to compromised WordPress upload storage, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing campaign or a malware distribution scheme, potentially using JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=concept+of+human+values+pdf PDF link annotation
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086a829ab75f---popalisosojuvamevi.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/38593582380.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/baligufenamozasejuwiw.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/4748907349.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ae65495a1---41148082926.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/14614388326.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c15e71d532db89a0783362192e251266/58885951835.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/91728421302.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/marozel.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16263763125278.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3794cd17c0ec64869c0ba64a22b209b9/lajoxupelumusurovutug.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/53a577fdaa218b7a63d4485fa6059722/rapexugavakodikuganoj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db0b0fc5d3c---86939967390.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6ba2a6df854fb57026f49b83bd28121a/72790801165.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160dc136951a24---93273366208.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/40972220792.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/36124865105.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/ropuwigokufogiboduxesap.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/95135776631.pdfIn PDF document text
    • http://canoeing.by/pics/files/77389241448.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/45972613596.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d814a8ad33---wiramole.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/87737365028.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/jozazitawiv.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/69936147874.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/q011rdl7mcje85p3889739qjnn/zixolumikepol.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/gokujiwivegovozumenuza.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_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 18676 bytes
SHA-256: a43af1ead83d347c2b0289322bd81d409391191028beca305d1ae3e22dbed1c4
font_01_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 10892 bytes
SHA-256: b9a1512e8811f1a36dc69b4b3b52283da1baf787f6e543c6af3165a56d76544e
font_02_sfnt_off00013ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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