Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65088c35afd7bef…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 20:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16f8f4deb69ffa282535578afe452f1b SHA-1: feedee58c373b542544f22d56f0650c8c7703639 SHA-256: c65088c35afd7bef55554540d3ea5324d537ee82036dc2f7f4c4261db55319ab
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/318bd3f91153942a048a9021e2c5e37a/vopev.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d181fe29c1---12611751924.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0eab7cf92ea1949fc6d84380425fd54e/42833170248.pdf
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/23769599124.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c2411ccda---11564898200.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v9k1oj6hmb1vf87m3953far2d4/12005594985.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe561f252---16413509391.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7840a8b581---fatisiraxawir.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5e8eb2177---21761381597.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/43051679773.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab73ff367ad---magelubasejinag.pdf
    • https://oklogistic.lv/upload/file/bigedali.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/34049okbhebmfojkhijo5ath3s/9868657265.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/sujajazonosibinigorejida.pdf
    • http://garmagostaran.com/Upload/file/miwoweniponitog.pdf
    • https://ebooksweb.net/files/file/91181628492.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d1b0a50d---90659348712.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cf8a71c76379e645a44ebf9b4d7b6be2/zoralogomevanoxitiborino.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09732b17b6---fozanabafirilumujunabom.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/csrtc51bg6l4qccdi1b265mit5/dumaxamu.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ac785909---balamejaxakuz.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160738f8add360---98824243059.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55f39c9da---febemofiga.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j4hms8l7td3vfsrck901tu9du6/59685700852.pdf
    • http://vitanova-cattery.com/upload/file/9039989893.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=high+level+assembly
    • 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_off0000ea72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 16792 bytes
font_01_sfnt_off00010284.bin
f6f9fc7ac9afac4f1a999c79a4572ae3341813eaa057026ece36c9f31db08a63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 16608 bytes
font_02_sfnt_off00012df7.bin
404f9eb125d41182b8d314c97a25772a8a3e44d1a3e55eb4382888e9b76703ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 10444 bytes