Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8aa0a24f70c418…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 09:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 215df0ba96678419f2855d502ec3c136 SHA-1: a69ba69dd94500a855bb2197c7c51c9929b0b345 SHA-256: 3f8aa0a24f70c418c8133a55b7665c5bc59c114c744ed97f02dd0c5eab0730a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://salman-group.com/userfiles/file/taropawomu.pdf In PDF document text
    • http://smirna.pl/files/file/bepot.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vitafabukuvorodaz.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lazududolomawulodexusuvom.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/96484644240.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f49a3f9a7---80415551786.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/nakutobinamixezejowo.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109051854403707.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/91493732615.pdfIn PDF document text
    • https://designclarf.it/file/3057072464.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/76484912642.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vkf0mp34tmkn6hlhti4h59hj0l/vaxarajis.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/babudonofavixujig.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/gevupatuwamirupadofoxijux.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/tenixalen.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/42928403876.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/13278216848.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/mipobafidowuzonozefuko.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/fulunimurinevivijux.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/wipaxewinarupewo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613666fad0f00---fafovedinulezixowagesej.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/84254031164.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af54d45a25---62390636588.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/13709961285.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca5f4b005---4523612914.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///buvifunuz.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/gaveroxejapelirawejulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+flash+tv+boxPDF 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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 17700 bytes
SHA-256: f04005838b5bd3e216317c1efc6cdf965bb4739b2eff9275ff9439c2375d938f
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 10268 bytes
SHA-256: ac18459ef03481a09b2124b93e7149e642914d36bec4cee0bf7961de7219aa89
font_02_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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