Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1b22af0a1558fa…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 08:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a18699061a140b0ea1530cabb10ac792 SHA-1: 656045008e81f485da0a2b8dc7f1d16c9aee8a38 SHA-256: aa1b22af0a1558fa1eef7d5a9cc17f64de0dc41d9fa4259240b019e19bc06967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/37405467602.pdf In PDF document text
    • http://rivucota.com/upload/files/zutupegifanakajufavasewun.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/p5oafnq0lm0l7qbatvasn3kc41/lerafirazib.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/32267404475.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/33779541692.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xekaxutalenevibewik.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9b6cbeee---tiwoledulini.pdfIn PDF document text
    • https://susta.vn/userfiles/file/31573355517.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c5161ae0a6b---37430014505.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/tixavubajizenulagavub.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759ca5a52ce---zetevosa.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/41921388256.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/vekibibiwamuzol.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/vupakuruna.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/savixinukisalakevow.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/lazozolodurozubirowavoj.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/18816063510.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161332b7ce3230---35177142206.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2c860978d30fd04aa9615c0e6295cea6/75099140907.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb115bf69f---worogepiwugodoxutamim.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/36aa6c4e618c9ae3a9691e879b5b3202/peropijuneb.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160feef453c5cf---86009284180.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752d802aedb---59716788255.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/vekuwanekekipovenawofepab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hotel+website+design+proposal+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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 16656 bytes
SHA-256: eead34a46e0f8d9bf6ca61543538d8a99a8a0c404a46fc6585e9e09ab319186c
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 10892 bytes
SHA-256: ac53f10962ac1701a52574678c7cda819f431288f53b7aa94f3e0b26d296df96
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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