Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5831bfb2a7c212…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 21:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67c7ab845a9f89170bca23a69a42255a SHA-1: 8958c1a693de468f367fb8945ec07fc14e6995ad SHA-256: 7c5831bfb2a7c2126ae52b116c95ea9b73d19b45f655a84f5ebdd11673e9d5b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=fundamental+forces+of+nature+pdf PDF link annotation
    • https://kientrucqhouse.com/uploads/image/files/54121084844.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4522f16b71a3be3ac8772f80b2bece07/63433438006.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/dazomubemajud.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/jixovorotuzu.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/5401137438.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/wisifusilefasatejatad.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30b43bf5cd---57549858763.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609612cbd2c3b---lowefagerepizuwi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12e5cc402---45341521311.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/31e65dfaf0fec64f5180ee040113e0fa/wazorebowabobedamisi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/zudusoririkubovomadopog.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/39561963487.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ca73ca12---sowetesebabadexutetadu.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/16055810847.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/mezuxojazosaluja.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02e8ac731---21507520736.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/rujamusax.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/g42ng3fcm7f19bpm9fd20v8rhn/lunaxogotuxowolemeweta.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/wejadixevivaxafulugomesi.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/sojesopibasageloto.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd175f343b8---282290217.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a8028f78---51283362946.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/19328174114.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921b632095b---xapod.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dg47ju032jdnf7hg8i8ml2bfn9/figafajufozulumisuw.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d19474d4b---reniban.pdfIn PDF document text
    • http://maksimetall.ru/files/kuxuf.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_off0000c2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 10764 bytes
SHA-256: c60eee64ba67fae44aa4d7ea87ede83d11ecc472cd717ae6f2448e482d97f600
font_02_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 15548 bytes
SHA-256: 12e06ddbb22e5b1dd585e807b74b3972f262b43149f8d64aa604c7b873ec3f4c

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