Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cbe4d30dba111f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 01:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 668dda1a73e064183fddb0e7d47b6445 SHA-1: 016ccb9b22b2c3a5941a337695d8cf6188f41214 SHA-256: 78cbe4d30dba111f9a836d44e618876d916b5cdf9c1d491330635a82ce965a24
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple link farms pointing to potentially compromised CMS upload directories and disposable hosting suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inhome360.ru/admin/ckfinder/userfiles/files/19651436288.pdf
    • http://dogable.de/userfiles/file/muxarodanizazavadatilivo.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/63495758007.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/nezuluwovar.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130e61511dc7---pijoginuxisilusop.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/68860952698.pdf
    • https://iasvn.org/Images_upload/files/todidebe.pdf
    • http://bannermaul.com/userData/board/file/19738161387.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/35722962623.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d974e8de---23770008572.pdf
    • http://nuitsdartistes.eu/images/file/21858766829.pdf
    • https://travelsafeway.com/userfiles/file/78078898272.pdf
    • http://impressivetravelvietnam.com/upload/files/57355805438.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hsbd7muh40mb2gem2gnqkkupk9/sobotalegilenajesedisojev.pdf
    • https://dodomacnosti.net/data/file/42363079899.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53f64f1bd---pexazewipuzedozituxen.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/tivogatabuxukasatuvupav.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/wawudikogetiwoliwuxivudu.pdf
    • https://albizy.com/ckfinder/userfiles/files/tavarusaxuwutov.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/zixutamuroga.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vv70hplgop7db71qldc7o7ltao/tikulutaxefedumow.pdf
    • http://seattlebestteriyaki.com/uploads/files/55381872830.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=new+york+movie+download+filmywap
    • 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_off0000e180.bin
6149fa382a3ca8ad9a2c4455053e3c399267027dd18206d8a8a77b18523dc53b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 10728 bytes
font_01_sfnt_off0000fa25.bin
01474fc364527175d057644bf961f4381cdd11e23222fa494e12a40e31641d27
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 17692 bytes
font_02_sfnt_off00012766.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 16792 bytes