Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c991168e459238…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 04:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eff9d5b9801ef186b5b8218ff9902e98 SHA-1: 2e700d28397894065922b023f3dbdfd3762f74fd SHA-256: b7c991168e4592384de2e846ae1817b3952ed7853bb8854240ded00caaa2b575
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI links and the 'link farm' heuristics point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kanizsakran.hu/userfiles/file/kaxeke.pdf In PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/41573429471.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/momiwufo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nebiveraduxevegekugagi.pdfIn PDF document text
    • http://slovoveri.org/userfiles/80047895685.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kenuboruveleg.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4ec46ba801ebe5f38b67a49d6d8ec443/naxisaledawepuru.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614389bb13a73---lugejuxomap.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/murasupawatanikakopi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/59372135631.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/ruzulonanupevitijilige.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/97043045796.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/1386800539.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/29271252943.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/pegik.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/ligevizidofefimudurap.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/70138808978.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/62409b82bbeba0bef57b0ed8618ca4af/54040652550.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/tubeso.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/10414397997.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/95194688107.pdfIn PDF document text
    • https://carlojans.com/cms/file/jasogilediniwipegudopi.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/xanosudadup.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rebusananu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ispoofer+ios+2021PDF 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_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 10184 bytes
SHA-256: ebf5db3e85bfaaad02ae0f0270af9c64e3614e0b8a7fdfcbdc67e35d49a99836
font_01_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 19476 bytes
SHA-256: 7feddedfbd0b3bec737b32a97540f0fe5b31947be179125f644caa3e77e1f652
font_02_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1