Malicious PDF — malware analysis report

Static analysis result for SHA-256 04014aaf6e79531d…

MALICIOUS

PDF

89.0 KB Created: 2021-07-22 05:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 328f2e6eb9f7c75496a22649133f0500 SHA-1: 6e7dc6ce82a5e5ce61592e0ed4419e7d63a23a41 SHA-256: 04014aaf6e79531d5b8da8bf6e366b536db7454a19aaf39a113ece24bcee061a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of these link farms suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3c8db008---46824110947.pdf In PDF document text
    • http://studiogiamberardino.it/userfiles/files/7522121108.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bd501b3d9---dagekozamilak.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/i3rfv6a9vk5ntmcolc7bkgn7r7/dolebokikumedoxomu.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/31179722710.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3e2e6dfe6---nezadefofosorafimorilom.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/bunudibitudavedewivumupen.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/kugelul.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/romosepijivorobibeli.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/rabadojikopomodege.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/pivodoledadogum.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/8255357802.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/lv1fk1a1po583f0pnbs7a2tcgo/notexiwesel.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/pafipezisanobe.pdfIn PDF document text
    • http://benly-carson.com/product/files/mepotevuseveput.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/diworewixijebap.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd4a386eee---xugukibagalezigomuxawan.pdfIn PDF document text
    • https://bataretak.com/img/files/file/pizuvizukileriteredez.pdfIn PDF document text
    • https://clove7.com/userfiles/file/51989465855.pdfIn PDF document text
    • http://strandedtattoo.net/file/vukabepujefepujujik.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/woxolofuxowulekijuxebogo.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/zuwelu.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/fezofepuw.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/5671616317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=conic+sections+geometryPDF 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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 18336 bytes
SHA-256: 27d5a8e45bfb558b21a70426b66c07aeaf4733f8b64cfcbab8d68be3ba8481c7
font_01_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E58 10512 bytes
SHA-256: 7f7d756ddba8d0e78f5c0f11edb3aa5c6ff906174c0cf1be106b4ba740c4edd9