Malicious PDF — malware analysis report

Static analysis result for SHA-256 4861bc8190789eac…

MALICIOUS

PDF

83.3 KB Created: 2021-08-22 04:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88a92cfa89449f6bbdbe3fc522f57162 SHA-1: 5d1830b3d8cfd79b407abe9896044d736256f07d SHA-256: 4861bc8190789eacc52609c1b509d9bfb8b2d53ab70c0f625c56b96f161acbdf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://pistant.ru/uplcv?utm_term=hashire+sori+eu+kaze+n%C3%A3o+you+nem+tsuyu
    • http://ave-france.com/pics/files/wunijilufamiraxoko.pdf
    • https://alice-immo.com/userfiles/file/77784808202.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/48861310664.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/59194064203.pdf
    • https://trvstore.com/userfiles/file/kabalipap.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/61481658972.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/xodiligevukunefidomitesob.pdf
    • http://ats-dz.com/userfiles/file/pozimifemimilalibifamewab.pdf
    • http://fkhd.cz/data/img/33240150313.pdf
    • http://morebricks.com/ckfinder/userfiles/files/8525956380.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a04b1578a---47399661081.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690fbe92b7---geworepeveje.pdf
    • http://anvlaw.com/userfiles/file/kafegawefozivoso.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wunil.pdf
    • https://campermagazine.tv/public/file/48861647391.pdf
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/65853730488.pdf
    • https://luathoanghuy.com/uploads/files/lijofosazefegozerovag.pdf
    • https://acrgruppe.de/userfiles/file/pulusugimad.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/zonugovujololovagejofus.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/jjn0e8i656up3j89vijk0s3ba9/74038709814.pdf
    • http://indecomavo.pl/inc/10520545489.pdf
    • https://delphin-bau.com/ckfinder/upload/files/33240224816.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5ec22ee5a---bijiwuk.pdf
    • http://retco.ge/ckfinder/userfiles/files/tasusafovapodufuvetagubub.pdf
    • http://biancoacolori.it/userfiles/files/38492996195.pdf
    • https://osakadentalcare.com/contents//files/puvovogusorajepazofabaku.pdf
    • http://habitat3.eu/userfiles/files/juxov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee6.bin
c229344865aa0a916f084b5daac305bda59f46bd96e2d0830f089ea203f377c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 10952 bytes
font_01_sfnt_off0000f7bd.bin
d5dca8810fa70861d140a219c820fc65230516488a3cfc319eeeb8abec33ef7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 17064 bytes
font_02_sfnt_off00012426.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 16792 bytes