Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1fbb5cc9d47bd1…

MALICIOUS

PDF

90.8 KB Created: 2021-09-18 14:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbc8df4f3c28a22cd1272334f85f4dcb SHA-1: fa2f0995fce730647a78460e40a433d195f6e009 SHA-256: dc1fbb5cc9d47bd1f35f39c7836887a36c115e2ff55571ec1c24abf3f0f60f4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised or disposable hosting domains, suggesting an attempt to lure users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://terracell.pt/images/file/59652935268.pdf In PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/suvufaxila.pdfIn PDF document text
    • http://info56.ru/userfiles/file/nukazuke.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa010455d---bopalevusa.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/vodijoji.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/24347742990.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/raruxetujisubugus.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/ropararejulipakaselade.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9a7d3674ff26bc68bbee6e03118aee3e/tesesori.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/28444082109.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/55781553767.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea78d759c---98379844473.pdfIn PDF document text
    • https://t2sc.me/userfiles/54333340399.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/wujigotijagefinu.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/vixozumuwizar.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/kanapapugavagagimudiwax.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/54829861553.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s0253ahn97097kqa0s8s805u35/1226206661.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d4cf612e00463e2aa77a3fd232cb4c33/bozobepijowiduwofuxa.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/50827063800.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/tiwumebonutufeluxovawe.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/22225361842.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/lomozavobajogak.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/fojemetewebizubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=catalina+de+erauso+lieutenant+nun+pdfPDF 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_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 20540 bytes
SHA-256: 701ab05f98835a7ae5a5466a60102de3e301d2e5156123474d6f870bf94cbf05
font_01_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001453f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453F 10624 bytes
SHA-256: 77da9c6a2fe981212e5043842fe1c27fc2620e3bac69ada6dc7fed9529fa4bc6

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