Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f078ad1efe21c2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 15:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02434243532b018d38c59cbc9c017364 SHA-1: 53c1eaf06ffe6e8f7b62ec75ec7ede97ffe6365d SHA-256: 19f078ad1efe21c24ffe95c3656659dde07950fd16f52d158410d44c41f0ab74
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The presence of external URI heuristics and the link farm detection further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=orient+32+inch+led+price+in+pakistan PDF link annotation
    • http://mbjarrahi.com/UploadedFiles/New/file/xabosazuwiketebukazid.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/lagupulatofuzoperutitan.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/gufinesoxakisab.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/nozuvipokorenil.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a957a54e6---lizutad.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/pazugojevenobi.pdfIn PDF document text
    • https://foulardfotografando.it/file/tixena.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c36cadd7271553af78ecfed2aa66b783/witetejebanosizoneve.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/piwuzitukoxonulu.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/mugosuluwutak.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/39662434218.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/vagovegutukojenerawi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427e67142c1.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/gokakidenap.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/82880448886.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/jeronibor.pdfIn PDF document text
    • https://people11people.com/uploads/File/80187503407.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/39413598578.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce7c3d73f---segaxanesutiwe.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/lotanib.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nogotomakofewimabevuporo.pdfIn PDF document text
    • http://master-br.ru/img/file/23889568994.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/42426132645.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_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 17304 bytes
SHA-256: c3603d12dce1830357aa4b5c8a1b420b34c4374abd5ed1a75664acafc369daf7
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 10900 bytes
SHA-256: 056e14d42f17f11037e0da1a8abf0dd42c266f2175405aee7c89239f2f304546