Malicious PDF — malware analysis report

Static analysis result for SHA-256 812b0cd5c8e14e89…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 20:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cdf29be6c92dc2e5c7437127f3ceaf4 SHA-1: d5006a33766b859deaff8915d42ab4c0840a60ee SHA-256: 812b0cd5c8e14e8968b9b4bfa099f1e4600911da167f229ed0adc71c87b90c86
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

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://laborke.ru/uplcv?utm_term=minecraft+unlock+all+packs PDF link annotation
    • https://balticstroy.com/uploads/files/wapejewogamavidimozu.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/88151952379.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/duxibazavad.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/zixut.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/zonogogugi.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/xizosazowogemutuvobiveb.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/pixupewajilisimaj.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mhfttjaji8d322djqj4g23po6t/78336369852.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/60217478046.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/12558597345.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/10877337405.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/18225529967.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918202718974221xiv0f.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/jovemo.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/16033309696.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/fenowalokepavexutotezigub.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pj56msi9c8bm6l9ibsfnlgprpj/40808235552.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/pijovilekojed.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/54329110163.pdfIn PDF document text
    • https://mlspoland.co/files/file/99563372498.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/41d18afcd355035559767ef0a966501d/51926888056.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kunujibinalew.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_off0000bbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD5 10656 bytes
SHA-256: 39c0b89b86a96cfad7e94be05ee5a4fabed8247ab0449b701ef4b8025eb9b9d5
font_01_sfnt_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16092 bytes
SHA-256: a00ab1a173b4c2de4a2164eb4a7e84f8c178fa50c72430308008ec6abf584ba2