Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0303e59a93f5b6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 04:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13a0569184b1648b55ec858b9532a82f SHA-1: eff7527e56a482f82abe7e65c3b4ee6364bf6187 SHA-256: da0303e59a93f5b6380cbf1bc1968193c52c3acf8746781138fdc2636b76281a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://jkmdc.com/aversystem.com/userfiles/file/13177902208.pdf In PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107190451143066.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/xoxabuwakotijegiwabobu.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/23805109611.pdfIn PDF document text
    • http://olympusflights.com/files/files/60721328295.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/masuwelemotomuba.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/dodajosabafukemubokopum.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xoxofosuvupox.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/murewapebajevovagebenuru.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0e85d2c38---bafogidifulevonojokawelu.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/12164804837.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/63062433976.pdfIn PDF document text
    • https://gangnampools.com/contents//files/juwuzetisikoku.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/xizivusonolitenevi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9e4572e97---fejepepadetozepanotaxu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adef0d1d499---9924991554.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108c98b72ad2---moxinoxefupobakal.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/78105709534.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xudutuvesovegi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c69bf2991---86966296225.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e8eec5c9---63527972482.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/84625331018.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d76cda16efbe04eaf7acb9595ce0d3c3/84031768164.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/30148111350.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a057a5a09---13581303139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bhavantar+panjiyan+form+pdf+2018PDF 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_off0000b6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A9 11280 bytes
SHA-256: 655b67a6961cd669f61be9bad1e4809c609b723e96abdbd54e1de1711b0e9b09
font_01_sfnt_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 17340 bytes
SHA-256: 71778c15c1051fc2bb619886e302ba4e04b0e743b6db4ebb8ce310247dba81d2