Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fb2a9452f42e3b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 10:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35dc3765f7119b431c6402c0af760f26 SHA-1: 9dfab51e2df19f5966a5fe20a6d44e6472093b5e SHA-256: c4fb2a9452f42e3b530c0cec73019b41d90c02bc7439021da4ed0ad0d2cba754
196 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing remote access software. The numerous embedded URLs pointing to potentially compromised or disposable hosting further support a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ptogel2.com/contents//files/4966427381.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b4b2b9846025c385b020d9de23121c75/zakodosolovatuni.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f13aaceb4c2369fae7b146602f10341c/jopuxewulut.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609902687f28e---menupupuzodasi.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/bufejonotetakakudog.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4fqpev0farep9tc3ti34c0np81/41563704210.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ee2ec511---20665285995.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/85979333798.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082189a01c97---62837031839.pdfIn PDF document text
    • http://dalaichau.com/files/vubizomuronenuluv.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/munotozisoninon.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad96a31a5---wesosijanu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e462b14d1d---tivabupudibipametu.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/bozodewulakusepimese.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/86ubl4df94gpqoi3s5obtunsa4/46656529390.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/79101079004.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/kisovijexufuwupepevi.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/89294320044.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/1495439000.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/773d2fddebba107284cd72735e36c7b7/22600497433.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/kewebebalub.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d09ml5938b3fmgadnrr55dsu2g/vonijemurevabumajaj.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/90909762666.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/58ae45dc70edd8f4aee4b640ab128a9a/47958598151.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/44981543884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=garmin+forerunner+235+manual+bluetoothPDF 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_off0000ba9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 15816 bytes
SHA-256: a3ac559f9724949cc7e05a4e8d97f2687e01b63cd7e26af03f373d438ebc28ce
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 11016 bytes
SHA-256: 6e8ff81b87c3bfd92cf9f1ca21e882a188277dd0fb22e648e03252bae3f8e6d9