Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a2deaa01f6204f…

MALICIOUS

PDF

98.0 KB Created: 2021-09-04 02:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cc477f2f7ad37f115156231fa87a116 SHA-1: de280229756ea91658f57c19d0ce123b4d6f2495 SHA-256: c1a2deaa01f6204f504f2a2813dc1b0d9c2c80111645f0cb6b68b44f5d7c1354
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs structured as a link farm, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly indicates an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=lab+assistant+syllabus+in+pdf+hp PDF link annotation
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/12a815grh8aptivlircburd36u/muvujijivipele.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/bobutivojulabal.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/vibuvagewesi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/6869269444.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/13505308522.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/50067093417.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8d936d82---zufoxif.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818199a45ca---17975911499.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd17c17d93ca5c43d8376725c913ed01/wejebunugosila.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/rujexom.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/31051420215.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/95ba06c93293b557abdd20b44e5503ed/xuboxew.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607932ac48299---47554116210.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/waziputukeboxopad.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2b15769c---86356321427.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/bd222174c539d5556336a263f72d3c94/79277833217.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/zumukijuluvifitegavejav.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/fezoxoriperog.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee7e374c8---632193362.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/61919729823.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/febinodixifo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129277ec30ea---jodemid.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/tagiwajilaganapo.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_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 10556 bytes
SHA-256: 15427d9c45eb761612e889b6d842c567d637646598c679f9de766f5d25f4ee95
font_01_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001439d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439D 19964 bytes
SHA-256: e7567f85e5b157d5e207b19c41a479b1eca42e8db760a7f86d5fe1f485f3005e

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