Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf8bb5dcfb3558e…

MALICIOUS

PDF

107.6 KB Created: 2021-09-06 22:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e113fd3d26c8898696b8aacd1ed1cebb SHA-1: 842fe6699cf2e521b7ef1b84ae2f7c662297c89a SHA-256: 6cf8bb5dcfb3558eba8871ce339cb445996935553648a206c3d0a4e67eacacf3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bda.ch/ckfinder/userfiles/files/55305123364.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a6b7e0dd---firajakubipaw.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa3db1b93---libatanafe.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/52fc1b8becfbd9d1453b1d465c85498c/nadinegalenes.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/podaliwezemerik.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k58glsojs0rp05u1nh37bgacc7/dujaxagerukemox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076879d5bf89---fovaputaxusurabosizevi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/18092afeee42a3b0f8ec685b128e4bf0/27740627429.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e657927a---98392677248.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/115f71180ec9919b48bfb99d0b568e58/xirexixafusadapikila.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/23724442317.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/lamufubuvuloma.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/sojeziwaduruja.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/nipexadubemukofojewavezi.pdfIn PDF document text
    • http://cloverdiamond.com/file/fopokusosepelulo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072570ad2e21---3227643223.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3373ed73b4---9853386651.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40330107406.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3e84b690---vugedobilubudimakedosawok.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/809381a60d319fbc67c4c7fffd009911/27289079312.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/71338072886.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beda0c50f4---44848783959.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca55418feb5---bewezivabaropiwulo.pdfIn PDF document text
    • http://bio86.fr/fichiers/nerapofawizadoze.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lf7q4roguuh3ms23i4shcgc6up/bugubewitodipobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=medison+x6+service+manualPDF 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_off000133f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F8 10864 bytes
SHA-256: 9616c3c3c7f4d5962cedccb016eea05f78f903f7be0eda62ee5eaaa5a7cb416f
font_01_sfnt_off00014d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D12 21704 bytes
SHA-256: 245ece901d5027f3f2d8949bf89d54cd93b1cb9aa3cac40cff194aa9c89fd356
font_02_sfnt_off000186e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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