Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6d4c445eb9da14…

MALICIOUS

PDF

73.9 KB Created: 2021-08-30 15:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 407496a5d1701cd4ad4311aa7acfb840 SHA-1: 66bb2b15050211ecf8dafb76d2d7889cf10062f3 SHA-256: 1d6d4c445eb9da144a373af7b6067ecdad29f4b379fc8cd6ef5dbb1fa63aed02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure align with phishing or credential harvesting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://aisef.org/uploads/userfiles/file/file/11439131458.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b78af687c36---bolarutumikoteveju.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b2b4bf1c---73973417405.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160967bada34c9---49543924933.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/88313860381.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2472726eb8---23865706386.pdfIn PDF document text
    • http://erex.hu/upload/file/xekukemifob.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a80947fe---libilelokubodibuvegozomox.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/450580de9e4e4172570791c8b400f4eb/losupudopawita.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/saweko.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec406e1401---dodaxudufexiveve.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2ca950e18---86692053112.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021820_10249_581.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/20668868861.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/90190363417.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t3322aoml6mjuqum568qckuh87/14110098498.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161246bde1779b---sijefizavonusafanujepo.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/kemedupufisidexofedumodo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8p9jpqsutqgplanv1rt6gq771s/84628341905.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/miworuwoxalowumirojega.pdfIn PDF document text
    • http://k1a.ru/images/files/file/lamalunajesosasimegefufe.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/18178cc2a3704fd2824f7f53f05fe014/90386170495.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/denafijuzaletobi.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/kaxogobaloriworaboz.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/31864865196.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624957908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=live+in+slumsPDF link annotation
    • 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_off0000c25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25B 9912 bytes
SHA-256: 69bbe8d82989578e137d8e86d79461289100450fa346da910e7a31789cb1ddc2
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 16272 bytes
SHA-256: 17772f50f54e90f350b38a6b7a101e0a76e59cdc058ac366b90f3d75d486a8dd
font_02_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1