Malicious PDF — malware analysis report

Static analysis result for SHA-256 1425e7d1c92d0398…

MALICIOUS

PDF

91.9 KB Created: 2021-08-09 05:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 323abe4d2ec910fbdeffff6a3d380a09 SHA-1: e62c01fae63563b1b40ddafffe613a01ff48ecd2 SHA-256: 1425e7d1c92d03986045db0290abd798515f3e72145f4dea1b22f73ebff3c59c
236 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains links to compromised CMS uploads and is part of a link farm, with one URL impersonating Facebook for credential phishing. The ML classifier also flagged it with high confidence. While no scripts were extracted, the PDF structure and URL analysis strongly suggest it's a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+prepare+for+tef+canada.
  • 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 http://inspiredindianfoundation.org/uploads/21816145765.pdf In PDF document text
    • http://orthopediedelft.eu/files/sixapanisofe.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/taxuwud.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfd650fd59---tiliziroli.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/73492306948.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/giwetazotovizoxegixetef.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210724_195306.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/91793963809.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f932ae69b---43619053375.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d396684cb---fekakozenafolafos.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/116b3cb5ee5354971233b1bddc72dd4e/45396067352.pdfIn PDF document text
    • https://agatanorek.com/files/file/menafigogitegomegapel.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbb6ad060---45584082255.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/51816591818.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610be5606ca6a---21533327522.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kg4vjlck4sk5ud4lln2mnlk547/netome.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2kq3i4eruu7nmst5bi847nfv12/10598608505.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806048f1f55---sabaw.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/zumek.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/rotorudowagesigevuzogu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ls62vfj54en3vm8nknv7csd5sp/38580667969.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/jovizuzej.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/98320137852.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7t51bbq88iim8fhg5ccoheg1g/20695875233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+prepare+for+tef+canadaPDF 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_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 10384 bytes
SHA-256: 9ed7f4a1267866b34907a2fbc5c74976a37c4fb161401c32b6b8a4264d8eb0fc
font_01_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 18852 bytes
SHA-256: 73760b17956daf7aebdb8f763d7986b985aff8bf3d5c3209530a509e19cc0500

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