Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74519fac59fc0fa…

MALICIOUS

PDF

104.5 KB Created: 2021-08-30 00:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e868769a3dae9befd4f06103c2c789a SHA-1: becfe4902d678d7886671b6c952ac8b8dbc94db2 SHA-256: c74519fac59fc0fa3d7460810f23bec751378a0b87411dcae317f0cc3603da33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://krisoc.ru/uplcv?utm_term=cost+accounting+a+managerial+emphasis+14th+edition+solution+manual PDF link annotation
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/85d9d4aa79c6ed5fd3f0e05b8782f5d7/59192666323.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kixezawo.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/xiwobijaga.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/97435693721.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/vusitekaxabojopekasaxi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/sao7sheil8ceodtd9gfjnjh41p/gewovakurusel.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b7db8358c32849021428d40c5f5ab083/korunipudigonemelojamug.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cfehr99t0tr6ni7ic73hoi0dk3/14864134819.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f8800522e417bccb7a82276fac5944a0/babikitamabitalamojas.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3db267fa2d---76353195177.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9637bebb---89295611895.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/fotepeminusitumaka.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gefabumesabek.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/21179491806.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/64699832800.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/09df26ad87a8566626890d58177d646a/3859996704.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/nagasezubopiminunifu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su2ksop0jtpvv6u2ogoapm2qvj/bunawexeriresufir.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d561932ba4---99729216122.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/41371589709.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1f45b2b348fb9f640f94b9edbf927b8f/71471701263.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94559533338.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_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 11220 bytes
SHA-256: a673f24e3d7eb9b4673360b310b9ad9032cf37e7d18a153566e907daa14040d7
font_01_sfnt_off0001464a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464A 19288 bytes
SHA-256: 60240eda0b5799b0c011abc74d1072acc6eed50fda37bc0b55ce58dd2fbd45e3
font_02_sfnt_off00017910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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