Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b62f34e554a900e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 03:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7087bf5cf5ae10445fcdd36088adc304 SHA-1: 13748caf2d56893dde1f537658f913305d46ae68 SHA-256: 2b62f34e554a900e4c91479c4e3f1aef67d585f3b4df513b14f6dce651c42f42
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users. The embedded URLs, while numerous, do not contain exploitable content themselves but serve as the mechanism for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://banner-ever.com/ckImg/files/67009265538.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/aa5ed3b45727f8df6cc5c57fa5ef019c/zujesunaretesil.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096d964af59e---ririkojuxukomilikawapax.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/84818219557.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/10264801202.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcc435579---julebekinepurawawag.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/fumanubovepoxanefeliva.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2190fd28---95932201739.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/weteropefopelami.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/sac8p2epkjvhp8ctsfd76i2kqm/genoxegivifal.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/75526931685.pdfIn PDF document text
    • https://foulardfotografando.it/file/9306495062.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-17/20210517005940766464.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607faeb5e73f5---xepimozoworaxuzaxigox.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e5f6d18c21fcc51a034c620fc52a4827/30870627800.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/53063513800.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160745770ecf24---54786354099.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/adb6dc3d335c6ab0cf1eef18e3a62ca1/51676713211.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ff44a2e1---89813697904.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085092333911---gexaxuzegotowefokudiranik.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5c9d90593---torowolavesavusobak.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16095d209dde7b---53961906774.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/efc3af1c1369d5b4a056caeb3c8b03a1/lokisutem.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/8590334163.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/5377921428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=categorizing+triangles+worksheetsPDF link annotation
    • 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 19292 bytes
SHA-256: a959de38f6a1134d4734a57be980d17997efceedcfd2689a2bbb890f39a55a46
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 10656 bytes
SHA-256: 70f85b2fc92c539172ec505410cc258f26c84674702fb2417ce7675dffc295fb
font_02_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1