Malicious PDF — malware analysis report

Static analysis result for SHA-256 5713dc01bcf1ee21…

MALICIOUS

PDF

76.7 KB Created: 2021-09-26 16:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 833ac21290ba6e93f0af8b379456d9b8 SHA-1: 80b5039d16e83b795358f73cbcd13b76b845022c SHA-256: 5713dc01bcf1ee214ed4fd845fccfb67c6044e45867be784427662a8d8847cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://oniceh.ru/uplcv?utm_term=uc+mini+2mb+apk PDF link annotation
    • https://renetravel.ro/images/files/73888185111.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d5b1dd60---xotivotelovebojetelidum.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/79111469891.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a08d941ff8---96616888233.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/liduwoxadomuxubapajujur.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/381334efa696e7602083a4470446e9ce/79152641117.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/wafitivip.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/38313828238.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/34372206026.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/18800213530.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/dedikezabisafugawaneki.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/74560089180.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/18495557947.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/69405628013.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/75987084074.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/luzezakifijomuw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392ff21caf2---47092636114.pdfIn PDF document text
    • https://seikai.jp/free_images/files/43398270218.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/joxikuduluruvadufu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1c0457b2a4d5039f46df3703ab1822ba/94707318663.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/27951993159.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/84315165040.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/47264936713.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/farulabosugobov.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/7028531345.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25E 17920 bytes
SHA-256: 03661a68e599a7dbce03a6951cbcdee8841fef47e37ee7bf1e9d881bd6d4356c
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 16256 bytes
SHA-256: 8012ec8602f853e1832512ab3fc112b22bc052bd12ab557362ef412dd0560f53
font_02_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 10232 bytes
SHA-256: 6067bb23928919b04e3890b099138149efed7bb37e5146bbbd84ddd5c6cc0f67
font_03_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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