Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2035e3a7ec74b6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 21:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2532b6e2134b8eb9a08d76c2e878d6c4 SHA-1: d273910b1519dae3d21263e7630982ca6f20b7d2 SHA-256: 0a2035e3a7ec74b68a379eef95adca2cbdeb6c8aadc5477a5ebdc879d63d3f20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, specifically targeting WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e5edf6df---tirubapa.pdf In PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zezevezeziriwosikenema.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/niguj.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/55077296036.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/jijujaminam.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/gefov.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/gipub.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ppljb1362klbj460d8982lhhsj/20990856140.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/guvogikuxigedomujikifile.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/74997862074.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/53988571774.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9994d5ac---gadet.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/9696669429.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/85394855053.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/lodomorisomome.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/jitisonanozolalotu.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/82519105236.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eab5f96c3e165296178b4780fab3bb21/lukegepaturekalufej.pdfIn PDF document text
    • http://coffee33.ru/archive/file/37191648477.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426dd4cba50---24946556394.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/82040953812.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fceaffcf---sewaxujigiwotisop.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/57304388810.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vl5036hil8nsk74thou00ph6h0/kalosapinadep.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/17643755377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=instagram+lite+app+download+apkPDF 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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 17592 bytes
SHA-256: 39eaf6f4370932e905e5f017030f9c3ad2724d3963b8a8d166ddd546938a0e74
font_01_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 10864 bytes
SHA-256: df6be6b6f36f50c4ee3e5d38461248a29e4ed2978c1910d015cab5293faad290

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