Malicious PDF — malware analysis report

Static analysis result for SHA-256 41689b3f3da674f8…

MALICIOUS

PDF

90.1 KB Created: 2021-07-23 01:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a2600cd2bbc208c90928ccba0d2e00a SHA-1: 3ac934fbbec002c9f33a45aa8a06ad60a47efba3 SHA-256: 41689b3f3da674f83ea6674645a794410d7bb2859fb21ccec05b4d8d9f13f18b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3d4c97683d5340d454365c2179747556/wopipuporadokir.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10843377232.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b8001cc1f91---77937761070.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/fedabijobofexitixap.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/32888593158.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/24140299351.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/favenow.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/4597134634.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ec1006k3i6rrohkqt3drd6t9qn/vumodozosa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f196429d9a---20116213071.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ov91co0r33ci9rgglf453bft3t/refakopiti.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8274f25b61---10476365.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/p760t7hmqukf5nb9lejnoeoj3g/povivolixoribujo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/pimemuresiju.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lupatirokupuposukogo.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/75d479c573962afb2459fc343fae8413/64624611594.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7836f926121e412045a64a0c7a2b0e1b/tesuvovisi.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wotitewiza.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/63189391932.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a668f7f2d55---malut.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/penonab.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ce6d3e1daa68445174ae45195193519/dojovoxunizesetisokemanit.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2ef169e6b26b1f5177fcb5301958a010/ginozefopekedojozepebomuw.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/raxojesilabafalofezo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/73ff6f7b4f4fde71c807fb82ca919b36/rijugibokesajikizix.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/zunoxadejijuzanuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=black+english+cocker+spaniel+puppies+for+salePDF 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_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 17016 bytes
SHA-256: 6bbebf9bb942c290407e96a9897529fc64796d58f2f1d4ee36ac14d12412da44
font_01_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E05 10908 bytes
SHA-256: 0d6a7daf94cf4abfd84da37c83faef9cb685ccf0934586385ab5aa3374c4c5d9