Malicious PDF — malware analysis report

Static analysis result for SHA-256 6583fef105804411…

MALICIOUS

PDF

95.6 KB Created: 2021-08-07 16:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f331ceb5b5ab62d1e1f146eeeecb1d0 SHA-1: 5f858e3d830c2676690cef1130442161783752ac SHA-256: 6583fef1058044118163e90edb85b26dc80a98c77c4116c0fd0cabb6f3442dc7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4d8b74ded---nuvizijixakarogopo.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/34c863b1f7699cdad32f07bc954f49fa/zeguxuwazux.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160790ed84ec49---satiwotasajozodiriruneb.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ddfcc27f5---kebarusulutuxunawevosare.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/80294684210.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/wedetuwakarowetixazudo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610921f0c0a5a---tozedoto.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/6380810042.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sjetsvj22b131mpv1ig65lldg7/buregiladime.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7ccb6b78---zewupi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1abc0f3af---buwafepolifilizutulu.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/6910687946.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/74137817203.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/24654888383.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ad785c9d0485516e71aa163afa2ba082/xibubirutejepijijum.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20161932635.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/14c2b4f4b779e461e90511ddf89f47fb/66480545910.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/50ffecf064afd4fb00273d8042317283/70641452443.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f019bca0---digaludi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210612111121485.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5798b2f0521a25b23c47641726c5c640/denujevi.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/leduler.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/jasodutofejimobotolivepo.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/kopokumajanikasujep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=can+acupuncture+help+neck+painPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 17296 bytes
SHA-256: 7ed08afdcb523621fc64ac185b82ee43fbbd47e5d766497fc8648e9d63dbab5f
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 10404 bytes
SHA-256: 9ec2ac690ef35559c510293a7fbc042edbfe06390de9207313a703457be7a003
font_03_sfnt_off00014390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14390 16956 bytes
SHA-256: c4b699740094355e95d5d680d6f14a91372419717d55ee2dc58b9b0a8fc7fa70

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