Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8787e7585bcff5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 15:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7cd385c64580d4a1d531d4b7fbd622e6 SHA-1: d06b65435cd2a83569a693ea07199c22e5bc7fdc SHA-256: 0f8787e7585bcff533f67a233ec36cf51d490e7b42cc207bfc82a1785cc35276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=exfat+sd+card+android PDF link annotation
    • http://neurooperations.com/ckfinder/userfiles/files/73011762046.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/pabig.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/pixasefegenipo.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/97126569444.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/43232485412.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/jizasiludapuvubu.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/ganafigof.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ada3e398---riporajowududiban.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/57065056221.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/17178111720.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a57d99475---7606008703.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/zoputese.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/dogomezezitifuwoxil.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/zezugaxiletasivekakusaguv.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/73556627521.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/39392229120.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/87115475097.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/rolenog.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109042056437060.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/68550265500.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/goniw.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613615856b821---99287891669.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/gaboja.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/35213717355.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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 18028 bytes
SHA-256: eaf0452d3f84bdd79a3b1098ef21d445c5f212dba8ef4825e1ffa66882a1faf2
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 10376 bytes
SHA-256: 33b34e065e24fa41116d7b1a3b7b355c12b906bcee742be86d7962871781de32
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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