Malicious PDF — malware analysis report

Static analysis result for SHA-256 25de46c86fb1d581…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 17:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c0f60105b71698da70e6009f414e893 SHA-1: 54830be3d5f6a322fc529e9232e15edd48acb905 SHA-256: 25de46c86fb1d581e5c924f165525f773c9124c37b22c81750e47d65aa9c3b7c
212 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on compromised CMS uploads and a lure suggesting a password-protected archive. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The document's content, though heavily obfuscated, likely serves as a lure to trick users into downloading a malicious payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://allytemp.ru/uplcv?utm_term=stardust+after+effects+crack PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614855185118b---wobadamuzufofubu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad327b6f1---vividikokewamikedodetimi.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/71085974408.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/bibekowujevuzani.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/25552916019.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65802550002.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/892328719.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4ff0083e3007b565539d4c75c992b326/zivajakugatakakinuko.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dgslcfp5qp5gqpr76pguh6b4k4/98453984807.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/78697857326.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/66725793964.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/kanajesepobuni.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/nidiwifuvofakajof.pdfIn PDF document text
    • https://thehouseproduction.net/file/melewivomo.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/77946318087.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bifapiwosu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a70509e27---sofotogusedoxadukadisove.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/tovexeberulagemifulatije.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/88268558380.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/fapetovowomigusezarizizir.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gamobiwinesisowataz.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/fosovibinakapamozi.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/gutamavodipiwakabaja.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/rifota.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/nukagug.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/27447397084.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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 18512 bytes
SHA-256: 7eae59ca3767dd63cf466991cedda211f7175c61b5fdd5012cf9b775f1054cdb
font_02_sfnt_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 10372 bytes
SHA-256: 07421beefad7dcb7e9185eb30a788ab08680fdf620745874d0038a83fa2d353e