Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce14687734889e71…

MALICIOUS

PDF

71.7 KB Created: 2021-09-29 00:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96ae1e6c77119ce984ac739d0951f24a SHA-1: ce7c469a59e5de5d38d8c18b6db54f152e72e763 SHA-256: ce14687734889e71d07cf3b7e8a6c8ff180fb76526f21716a87282f2ed925079
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=how+to+find+my+android+phone+when+its+offline PDF link annotation
    • http://rsst77.ru/upload/files/xoluwogafunomudoxu.pdfIn PDF document text
    • https://maisonforville.be/documents/file/11565281124.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/538367a7150b607adc0b8d3de56232ae/nodimoxiki.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/77178123838.pdfIn PDF document text
    • http://vhshf.de/File/buvejanopolorep.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/89137272677.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/69848060744.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xulanufisimovun.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109120456077884.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/konusirifotin.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/mepekupositukajogagofuse.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/45814433904.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/wudomitajalujowo.pdfIn PDF document text
    • https://birudongker.com/contents/files/48129662080.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/64689540418.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210926134756.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/7177751484.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161538818361b1---kemoxadobojopefedumibiti.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/jukorewosilosenakagi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc03a1fe5---50408961147.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/labirakodegeti.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-18/20210918015653131197.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/30701382608.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd48cea37---lokadaremixaz.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/dobanedokefajubawe.pdfIn PDF document text
    • 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_off0000b43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 16716 bytes
SHA-256: e890891624db6226a5ca68e6b408bad8341430663a661663a109a77ec8f478a9
font_01_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 10952 bytes
SHA-256: 992fec78e0789dcaa794e30b34da8e01c18984e0d044f47fd525cf4d142264d9

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