Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2c6facb508dcf6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 20:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d62108447bbdd1344f2d48b16f9fe3aa SHA-1: 560d3548321b7da11ec2f0f02ca5281f615da39a SHA-256: 5f2c6facb508dcf654df330cb7bc5504b507f34ffc671220a9d9d816141e7968
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The primary attack pattern observed is likely spearphishing attachment, leading to exploitation for client execution via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=beam+bending+moment+formula+pdf PDF link annotation
    • http://dynamic1984.com/user_file/file/82103784604.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/bogofawebifowo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8388761d---48133802506.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f5609385be126711d62c2495825d1212/vofadakikibibonefu.pdfIn PDF document text
    • https://digireg.cz/upload/virojolejika.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/audidbf2jabg48n560g90tk367/sufibavinaneratol.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/xazidikafijobop.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/viruvorenagimago.pdfIn PDF document text
    • https://agatanorek.com/files/file/tadenuzikezisukatopumopej.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/96664629348.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/36142340280.pdfIn PDF document text
    • https://masihpt1.com/contents//files/9017379643.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/1295468986.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/cb7e6cab8927031904f1d143d85d8ec9/gowek.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hj1a56b03l9pqkkqjisoaimljq/78015261537.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/11102244555.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/goditiwek.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/13366014474.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/cfe3b1eb7b14d61f00325984266bfb7a/zezejenuvedevomu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c57dceb0a28---74305919416.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/60448308344.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/63419662678.pdfIn PDF document text
    • http://ligneus.hu/upload/file/sexefemelimeribimurav.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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 10968 bytes
SHA-256: beb9cf654b48e9b34e8a25a73eddc671ec1ebbb5de8132984e96d899811b9b1b
font_01_sfnt_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 17860 bytes
SHA-256: c066e369a0119b4aac29556323cab800855637e821288af870fbfae9adf05e85

Open this report in the interactive analyzer, or submit your own file for analysis.