Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5de9645cb597af…

MALICIOUS

PDF

71.5 KB Created: 2021-09-29 12:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aecfa39fa89e7cd5e83877646c252048 SHA-1: 51ef76d50c00597cf572a864785f33bd74445288 SHA-256: 0a5de9645cb597af1076dc97b8d1d11e61e60a0709737dbd547f028ffae5e150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the use of compromised hosting, points towards a tactic of obscuring the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nomylo.ru/uplcv?utm_term=news+app+for+android+tv PDF link annotation
    • http://meditopthailand.com/file/87686885878.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/37361657607.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/juzasilolub.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/76aa5f95fddf70a8913355ef0808b217/maduxonon.pdfIn PDF document text
    • https://subded.org/userfiles/file/70942615444.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/lepafajosane.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/jisarogup.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/jerutadowavunafonodiri.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/nomitexuduvigo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/daae83e1795b7ff2c0c6975c4bbc7064/18067985783.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210913_15_31_0.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/muxezanavebemavamugefuva.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/84815547871.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/fizegegadivuboni.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/45256966162.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/10931377515.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/iuka05to82pdvd8tcifadrcuem/75546359088.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/budimo.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/98885790530.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a83686d43---nujesesawow.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613baeab233c1---duzejanosivepolebu.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/42453756970.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/21c6541bef796ca85fe40e52d8aed97e/vowomemurizuvezofurosuk.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fef830e6e---vipatapudexigutidelijewi.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/87102933170.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_off0000b3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B9 17568 bytes
SHA-256: 5893b5a49631393be9bd4b4aa2f1df558d5a932bfa4bbb1669dc628fac66092d
font_01_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 10576 bytes
SHA-256: 6bf594dd9c79a27d97549bcd9d1c391d68193b991cce411773d8b8ad6a7582d1