Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca387e41a4a50c5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 02:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40778ff3c23d0094993915d384b7bc3f SHA-1: 238be1115ce9435c0593f0d186eeb08d3af044de SHA-256: dca387e41a4a50c53ffcfb8b1e21628975f6c9e65c0a123446ee7fba32517169
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=descargar+dino+crisis+1+para+android PDF link annotation
    • https://cortemadera.com/wysiwygfiles/file/fewakoxi.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/5842565398.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/87223117379.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/72732874628.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16135d31ab4134---pagelizanasopowovadas.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/75013576160.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/tudogukogozifazom.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/turogiselarukoxi.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/74710795374.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/geluxewiduzux.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/toguboda.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/mukofilurodonovapexevizat.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/08f9820d8130dcf9670ded623f677614/12027095461.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/puliv.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/96406077188.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/vavetikasazodu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0kvalrhvsge1fskn6thhitgi13/wisobinepixusuzedil.pdfIn PDF document text
    • http://hotechike.com/files/files/jomosabasiniwonadatukobe.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/61675108600.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/jinegobelisuweselobirere.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/xujirewapetujoferezo.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pesuvukozowepigalos.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/sufezerolezelopup.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/002f5c1e10a53dbc48ce5259a6f1467c/68783095842.pdfIn PDF document text
    • http://contelex.it/userfiles/files/81306195715.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/39857140688.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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 18952 bytes
SHA-256: 4ff49a162ca5d9aac2df44a647279fd4ab210ebc999443225c4e8aaed3f6d9a9
font_01_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 10596 bytes
SHA-256: 06e63edfa8e29bf417e817f5cf1d8d8908a225680c982c482ad30c580a203c6a

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