Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bfadc31413813c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-15 13:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7df7febf8ed1ec798c7cc155a3b56f6 SHA-1: 285eb8c2e760b347c497017967627ca1adafb14d SHA-256: 45bfadc31413813c23357ebc91d9044c1e7db766b20b55f8116efecd86e99b50
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious document used as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7ntqd96m3fgprm0bbpm8ihe6li/bunesugotu.pdf In PDF document text
    • http://k2plusinterior.com/userfiles/vumukuta.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/27972956460.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/pilifikapojufakitokos.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/divodadupagov.pdfIn PDF document text
    • https://limsurdua.com/contents/files/sifowilu.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/78976846205.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/60785840667.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109021214103198.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/54940606025.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210915155438.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4f5def1f40efb400756c176235665ad/33491959667.pdfIn PDF document text
    • http://ifap.it/images/file/relidoxuzapobatojutifo.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/migomuterunanupazak.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/64859963591.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/tulavuvobevuf.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f85e59b4f0---kemik.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/47396586833.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/78320233492.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109050900234160.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/5250804289.pdfIn PDF document text
    • https://slide-bearing.com/d/files/setorilorosumusa.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/mojixugivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=inspirational+sports+playersPDF 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_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 10312 bytes
SHA-256: 223927620e816819246ff79b86713d4fcf75b8f35b5e23a517976f4a4dacd569
font_02_sfnt_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 14648 bytes
SHA-256: 67db66c14d1e4052a8b0f6fcbac4db7af670a8e5995756c88aeb8d8061762c3c