Malicious PDF — malware analysis report

Static analysis result for SHA-256 08599573c8ce401d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-22 07:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 763e6bb754f5e49c68e93f18ace10f22 SHA-1: dd2e0a3150b84035f03e614ec2c30a47fe20fbbe SHA-256: 08599573c8ce401d39ead4b1466d06b8b9cf565e3e8f94a8314b55043dc93c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs are designed to deceive users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85bd85d54---lisewat.pdf In PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/d466ddb6afa0c71e47862d7b22dcdd5e/namerusub.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/xedemixodajeliwutabelan.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f947aa40025f8da62eaf98c0b5395ca7/43398815373.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160701dbb281f1---37589232572.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/kaxidibabifujumimezeduf.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/wogajudokakupolanuvog.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e79d1622fb3---zuxidikim.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cca39701c4684c435c2e49d9d5463438/85110102615.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a830ca1153d---widunixis.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd27a871f8---45252079296.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ab62a128e---8925119580.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f1273b05a7e0e9e85c3366b540478ef0/19247391641.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/vemimapujufobe.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428050124112.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d9ca69d3ce7ae40c6a8e642bc9a5c2ac/likadaj.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/sabimuzeliketinowuvubi.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nubilumuluwinebisesu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429143121385520.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/teokah39lt308rv371848fr8tl/patalugofudija.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210708015858117127mitsju2f6a2p.pdfIn PDF document text
    • http://beateromer.com/bilder/file/66046455317.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83c1e37624---povejarudaxiluporet.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/39907417167.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/fetufudetopowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=discovery+park+mapPDF 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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 10560 bytes
SHA-256: 8dc7f2af89f969b365455f424c15abffe8a8a2e5763bf1c6f9bd557ddb110ca9
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 17152 bytes
SHA-256: a86d16669802368558a96c5f180c34f8a2b2dffab990c814d40daa39617fdac8