Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afc057e060112ad…

MALICIOUS

PDF

93.8 KB Created: 2021-08-14 22:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 9f0f223a4e4570ba7d41e077f0c7b22b SHA-1: 155d9f56bdcbc81b459c2efb88a3c0327c27fe71 SHA-256: 6afc057e060112ad76fb9e4a7ca5ca1a5fcd499a5f0b9954196efaee0459e846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload directories and disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://akkoryazilim.com/userfiles/file/989278045.pdf In PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/lewazonilit.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vogasazevuboxasadize.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4205caa94c0b85f346971d818df3c3f4/60950427773.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0b6ecb03---ratew.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/pubiterejutefewujeref.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/db37b937fa36f7b976050ac0447f4a9a/53812459325.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/vefufaroxupepurekagugawa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c241b5f70b---23477003378.pdfIn PDF document text
    • http://live-net.it/file/kasuxufofababesobarasozej.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6262dbfc---texodufoxigunav.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/55ea58e4b417faf07010e8f009d60d26/manodakoresa.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/igh3u1dkqbsdmocuccuerljo46/44866095981.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/pebobofomexelezonejo.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/vasomosudigobagit.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/efff068c2203ee1ca12f015568f388c5/87687359408.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/fibis.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l4871ot28r6nt9jid6nivjifc8/renidilezuza.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c537d20e03242634c5c6538536c8815e/sojitakidedobumola.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/70884239478.pdfIn PDF document text
    • http://mega.kz/media/upload/files/96547308433.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/75683822439.pdfIn PDF document text
    • https://zhansq.cn/upload/file/gurajokozavakejikajokedu.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/88857826224.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/kolebavifidizekemo.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/50637699649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=frases+para+15+a%C3%B1os+originales+cortas+para+dedicarPDF 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_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 11056 bytes
SHA-256: be0939507f0c97ec7ff49d009877e68429c7a199068e5a13f3459a7a095e0804
font_01_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13806 18096 bytes
SHA-256: 8394b81e3e25b67954da0e1b9250591e92aaf66029be2c040ff1d7f0331f4db4

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