Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7fc1e7f35f5957…

MALICIOUS

PDF

100.6 KB Created: 2021-07-27 07:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed2ba9246d8d279365e9c79044bcceb0 SHA-1: 8e276367d92529a80290deb4010e8d59c7bf07e6 SHA-256: bf7fc1e7f35f5957ad4d27be65d0f0dc0f74b722fd6a9e800ab3a5d34fcd822c
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised WordPress sites and one directly to an IP address, suggesting a phishing or malware distribution scheme. The document's structure as a link farm on potentially compromised hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbf3c58b52---86980930045.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160836bf527aa9---vosarupegupuwulimovifij.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3imo63ro5u5t2h2mtbrsb3be2e/wurebira.pdfIn PDF document text
    • http://autovoda.ru/upload/files/79905876122.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4fffcb09cbet4839df66s4du53/buwupozi.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/96730982167.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de669eb5e4f---puzunotetesawelifirax.pdfPDF link annotation
    • http://animalscipublisher.com/files/upfiles/file/pixurexe.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/26652282587.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/32590126357.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a929f38d112---5812652453.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/69223842842.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ba27ecc7a620ffc1e9e4ca054cb7cdd1/pomopiseselutabuji.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/3810834709.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/kugowugul.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/82035031846.pdfIn PDF document text
    • https://mahae.hu/files/files/79667832529.pdfIn PDF document text
    • https://kristinanamaste.eu/files/menikejodesuxomakimaga.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/97341715769.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/4oq0plq153f4sah2lqj6s0ith2/77333666172.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/mofogekerugigunapu.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/34219116307.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1480a9bd5aa724189a7cf1446cbe41df/85136893048.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/33042118828.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/denuxojareli.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2ada8672---xipopijopepepatulujutir.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1b040de94edc83579e2958bf87c398af/faredalos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=28+creencias+adventistas+para+jovenes+pptPDF 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_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 17408 bytes
SHA-256: 4507dc1480aa5ae207cb081984729d3dd8af8e0a90d0f4c4b5fcee4a1682a1ec
font_01_sfnt_off00014fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16806 10888 bytes
SHA-256: 664ee3ccb049507f16da68def48aef3b4b8f834bc2f6d8842b6d9a75e8c240a1