Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc789f913c6b9a1…

MALICIOUS

PDF

94.7 KB Created: 2021-07-31 08:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdd5950aa54d3140fd3c069e8d488da4 SHA-1: a0cb6770d1248eb0a46f503a9523fadd017c9e05 SHA-256: 3bc789f913c6b9a1ffad741d340e13bc4155799105f640d5bfb799a9bcf04b12
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade security scans. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pendekaremas.com/contents//files/96623902626.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f6jtul3lba6j6tk182bt6krbnq/80862831710.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aad1442b1d---gowem.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/32830361054.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/29254890104.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/drejrm4t9jin9halpcg68floc0/bokezapirare.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/51161712248.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9b236928019b7ffd590a88b7d898bfcf/sumokap.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/89881506820.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16104b10413c98---98719028759.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd488682e---7648822065.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087806b74da7---jipofuzepugalov.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bff918a2fb4fdf90d97fe1d93cf7f79a/nozopirazol.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd6b8d23d---fepanizunoranamelarek.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086eba6c99b9---rivibodebokipod.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/zulodalexisovuguviz.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e59d7ca1172796337cb011de1b188cba/60443985330.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/kuwonolepeziro.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/xosuzavepi.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/74923588960ee431ab4b4d.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/520adf4eb18303b2acb40221bff51db5/60110228717.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-9/20210509025021338419.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607321bd98bcf---zuziwidixotokuragiwix.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19645705704.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/topuxima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+coreldraw+x5+full+version+bagas31PDF 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_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 11404 bytes
SHA-256: 244a867ff64cf08c365775598f45f14ba812c1498770196f04febc1408dcd898
font_01_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 20932 bytes
SHA-256: 224ba34a0e9925beed67b583ef5d0c9d9440337d0d521d7f4adcf1a6676c5044