Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bab5205f88cfd86…

MALICIOUS

PDF

89.7 KB Created: 2021-07-23 05:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf448b396fe655546dbb91bedaf45c99 SHA-1: 4a7a780dfa49146785cf03f969f45b6f52faee9d SHA-256: 9bab5205f88cfd8601ad2d44fb065902cb63f68d38ef5da61a53079fe3c13d13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. One high-severity heuristic identified a PDF link to an algorithmically-generated URL, likely part of the redirection chain. The presence of external URIs and a link farm indicates an attempt to lure users to external resources, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 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://vagtteam.dk/userfiles/Files/90115944842.pdf In PDF document text
    • http://wintec-samu.hu/uploads/files/54440966672.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a58173a7da---42344142818.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/lojemowudagofanovigukago.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4a6a584a---63237832184.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/se5j3788n37f98v60gji792mo2/76528360905.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/20427541780.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lb32qr42mjmpk7n7pbbi4q87ai/bilabosufowewelupirozap.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/fugesavulavira.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909168320f0---bamonusijulo.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/kusifuvefavivukotodaxusu.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4878e695892df5233890bb6e68a1516b/goxudib.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce7c5ac52---saxukawoseduka.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/12903015225.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087da2bee725---xulapalolesusebiditufeje.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9lt7ar8qr463t5rbdi7r5u30l2/98994666227.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/62169250675.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf8d4f714---famunotolubi.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/9206755262.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0a4da66c2---87717797682.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d855c7e647---limonujenigumazaromo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vokofulajibiju.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/15701884082.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/xijuwugumoxepufew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+grow+chinese+cabbage+in+waterPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2358d5e900c35755f90f06bd14f0501c/75406842213.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_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 17136 bytes
SHA-256: fa2b481bdd3bff8684113fa98a96ffb6e591264865716c82d7cfb4e7bb59c6f5
font_01_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 10680 bytes
SHA-256: f19d5bccc4fc0ccc5d83ab6feffa04e170ca21f0c8597c1bcce241983e58b697
font_02_sfnt_off000140ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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