Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10c60c62757cfad…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 13:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a83756ed8fbe38e07f9b842187fb015d SHA-1: cc6132138302710acd62607fa671ad96803b3a84 SHA-256: a10c60c62757cfad54d99b1a6a19add18e1895dca3456978cd8019bd4be6be07
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing lures. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the file as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://voyageaventurenepal.com/upload/files/gepisoxuxoxojosijobat.pdf In PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/56637682021.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48bae80caad5d0fb1d98c59113a94f8b/45932919138.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613846431b01c---fopujorerosoxowajanami.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/57329894814.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/53303244759.pdfIn PDF document text
    • http://szhlfz.net/upload/49901600630.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/52897066127.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/lotiborolal.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/44730048268.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/voxojeletulaxifemud.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/93127726041.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/totedowidizonemuj.pdfIn PDF document text
    • https://ayurmitra.com/files/file/24282233914.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/8585099642.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/37881180282.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xepobozusiweb.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/70110941568.pdfIn PDF document text
    • http://smirna.pl/files/file/33091492763.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wawidivuresedixatafagumuf.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/jedabelu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4243f980---36959204424.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109040144184019.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613340b2e131f---tafujujunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=discovering+statistics+using+spss+3rd+edition+pdfPDF 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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 18168 bytes
SHA-256: 3229e217933bece7c53c7120508f694c52311db8dcbf16b51b135e7ae5068f9c
font_01_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 11088 bytes
SHA-256: 7b14cf1b9325fe52b45d5d71c8c1c7c82e4acaa1f53ff02312f3a037761aab3c