Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cb68661a24482c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 08:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a39b7bc04e6a2825b00db5af8493099b SHA-1: a401b5052f5cca80c7cb76ad5c7220effb89853b SHA-256: 19cb68661a24482cd434c0ecff895101cd367a415d9951abb2b3393194757297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=bluetooth+auto+tethering PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/27b6676446ddc4f9fdaad52a9443a0ba/47688806233.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0724f25610d269dba448bf860e118232/35034272127.pdfIn PDF document text
    • http://thongthien.vn/upload/files/zewijotewelibarevaje.pdfIn PDF document text
    • http://space-edge.com/upload/files/biwarugelif.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/96357961527.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210912202542459937.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/xalasaporigesal.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m9oblvpu26nq4otpphu74m3u91/xojubokap.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916105155666653.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mipadosemem.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/kiwogedagoluburarusinugil.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614429d9e9404---43599192372.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/28872030880.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/15490419298.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/sokul.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109012153392099.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/wumuduvoxutuvix.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/14831266256.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/95078688464.pdfIn PDF document text
    • https://ka-base.no/images_content/file/nadelubegeb.pdfIn PDF document text
    • http://sun-tes.ru/files/file/miseju.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jirasinomawawupize.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143f14a13043---lovigosexowetuvigelesuxit.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/wosuvosuxugo.pdfIn PDF document text
    • https://iwistw.com/upload/files/69289295177.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_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 10372 bytes
SHA-256: a08d32dffd0789b91ba15e34ba263663e68d0801be235e296f2bf99efe023a59
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 17208 bytes
SHA-256: a1e1d01c4ed36a7c858fbce3ff3b8dd83322a903c0711505ab2968e57cd78643

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