Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2690f7320fd8d9…

MALICIOUS

PDF

96.7 KB Created: 2021-07-17 05:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 088407da32d503a2966caedcca99b33c SHA-1: bfef46c4214e63b8dc71b0a0cedabe87e34ee664 SHA-256: ce2690f7320fd8d995a3258900765dbf8d4074ecc1c4255a32e6c0fd69e4fd53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://gitedu.in/ckfinder/userfiles/files/29065796027.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8235a3f879---bugerodopo.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/63340462919.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac45e8da93---36095713166.pdf
    • http://ratchadatitan.com/UserFiles/File/91599514864.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a227335d074---muvisoju.pdf
    • http://henri-ruch.ch/doc_pub/file/7452278788.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/su1dmog37ff4ofe7jf4c2am0c6/riwunexelem.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/2039171533.pdf
    • http://palami.by/images/file/zadasuluxura.pdf
    • https://aduanaldelvalle.com/userfiles/file/salobexafujotudosuve.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4fa28aad---logekijajugiwetub.pdf
    • https://vyaspublicschool.com/ckfinder/userfiles/files/xevidavokajidolozu.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lezopozivovuxerewuzutibaf.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c64b1fcf---xofit.pdf
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/tozavimifuranem.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/52582312e4673ae889437425f13ae21c/zuwewi.pdf
    • http://drtamerturan.com/file/61296860075.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b7f4bca5---xuderijojexafigopepi.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3940fc09---12174733861.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30e04cdc0---18189792080.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7ded08f71f7e8a777d944385b69c9b5a/diruxubutegeravarajebi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=perseverance+meaning+in+tagalog
    • 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_off00011539.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 16792 bytes
font_01_sfnt_off00012d4b.bin
df2d00b3ee3541800cd08d6e640bcd14b672b2cb61635ef1c8ef12acaf0707e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 18732 bytes
font_02_sfnt_off00015d1c.bin
b6e07fcf94ffb580afb3a89df4d0d8f8a15870072ffd57db4d5396a4dc0ff11f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1C 10640 bytes