Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cf32b44cd2862d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 19:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d5ac36ee6fa3f1759c79bad50714a9de SHA-1: 4feb4a7ac8f4ae916d70dd7d93e139edf8d7d741 SHA-256: b0cf32b44cd2862d89f481901c5a651f1ba9a0aed4b8e36911350df6cd97cbb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://wccflooring.com/userfiles/files/81364063648.pdf In PDF document text
    • http://dzirerealtors.com/uploads/mepexasajeduvali.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/55521502781.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fddbc53797eafb377d39f4fac3953ece/kiwekokolulafiv.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/28562615998.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/10097786039.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/xujagiligepibewa.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/47651831075.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/baronibulunevubemisezozev.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zuxotogamuvusiz.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67653924689.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/dipepadiregakufodolox.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/rnh4e1pbjim2d9sbcfeecm5rca/28092363058.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/23645895887.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/67040583210.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/86785245292.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/bametibukabadujixipujigez.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/penitofevofupunubuf.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107061044493038.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/kopuvoj.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/xoxuveripurodinagojerin.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9499d8f36---tejebuxunarumokex.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960de3b14---kepog.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6g9psntq88233dohrip34juuaj/lulobobosobesimodazoxu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fc2b6834---rizugotejal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=autolith+touch+service+manualPDF 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_off0000b467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB467 10640 bytes
SHA-256: 3d37509546018abfb448325e995eb893846d3f9349bfaec92251dd445896d2cc
font_01_sfnt_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 16512 bytes
SHA-256: 7087c8caad242234a5ff3781049a30d74a6e221e22fa4091fecb3f278b9495f6
font_02_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1