Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f610f2370e36948…

MALICIOUS

PDF

83.2 KB Created: 2021-08-20 18:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7ff30f122689296b2a76c4ebb52ce29d SHA-1: 2bd648ffac6c5a3615752b0133df8ff010c8d65c SHA-256: 9f610f2370e36948f311042d2167ec01d7868bc9ffc67c47660bfed0b8062e7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ipceurope.com/assets/file/20208619249.pdf In PDF document text
    • https://zold-kommando.hu/files/jazolijefog.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/43777345165.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/indrni8maf7vvp4uo3nrtfhrmh/9827807457.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/7956849592.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/pigusabevavile.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/51108538868.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba84bcf0cc---55903538014.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/97605853141.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160873f3f8273c---12928321007.pdfIn PDF document text
    • http://beiks.info/public/file/karazuzanawu.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/1719636949.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/noderurep.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/49603394020.pdfIn PDF document text
    • http://teakdeck.pl/files/file/71703578419.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ibh7b1iirka0cv22rqhs3eoe9d/kasamone.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/10093389553.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/pefogebotenixipigipix.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/147913571360e4192eda5b3.pdfIn PDF document text
    • http://cocoal.com/uploads/file/47454760844.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/vowobamenobilisar.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/66b2e8063ae99dce7aca9e2f81e3b3ee/59767854066.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/89313579506.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/35408583426.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/69872632795.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/46614447351.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beacc9a7804---nowinulefu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f887713f8a4---kubugezidomodurewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=can+vertigo+be+a+symptom+of+covid+19PDF 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_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 16084 bytes
SHA-256: 05b5318ec05e3d47b570d4be3f900c281d82057ad19f4cb706715ef04f8d8816
font_01_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 11488 bytes
SHA-256: 159a5042e1ac5fa4a890219e1ba0864e0c93a2e5ee96b695d8416e5cbf3725b8
font_02_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1