Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8c5ca7e6391491…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 23:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75aa2f1f7bf81e3664dd2bf35ec26acb SHA-1: f0571e38ea55a42da9c7528a63ff3f5f28b044fb SHA-256: dc8c5ca7e6391491cf212f260b77bc540c2d4bc67cfb412fd90a46e9c1aefc12
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'Password-protected archive handoff' heuristic suggest the document's purpose is to facilitate the delivery of a secondary payload, likely malware, by instructing the user to decrypt an archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=logiciel+pour+convertir+pdf+en+word+gratuit+en+ligne PDF link annotation
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a14a4420f---todiduwibegilafox.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bamuzunogorodanofesibe.pdfIn PDF document text
    • http://cy2hand.com/userfiles/femogasokarawezulivet.pdfIn PDF document text
    • http://come2menorca.com/images/file/92414191765.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/63506083911.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/546e9v1kbvfg4ihbh14n0buj0m/vilugekesozeduj.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/jejiviwigefogizasasasi.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0b3a8556d161678f765597485d4d1c81/75381422633.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pqmpvd7ploh1nruam7hppaosk4/66676658707.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/pumezopefalijepew.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/duwakewipuranifiwevab.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/26604695215.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210819_AC65FB026C7AB107.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210801_E3B7824F9903DE19.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/7622847717.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210723_C3597984AA14AE5C.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2af9681d4---79081219893.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/da57a1ff3785d78d7f66ab4bf5803370/63089498878.pdfIn PDF document text
    • http://rayanchem.com/d/files/domilejonakozunibifej.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/u1o69vii2qlk34p3gud2m66oqt/wuxeligibaz.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/66604136944.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9o47nc202b1mrihgiffpdoruf6/4482404354.pdfIn PDF document text
    • 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_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 10836 bytes
SHA-256: 96c2fce74821704ed85b9828e332bab3b6d8f8ae0c623a3a22c78508ca51816c
font_02_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 20280 bytes
SHA-256: da07a54b030efe14a2787ed488062381aac64c5de0242e99691d08cdc7f475bd

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