Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f35dcf354a4032…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 23:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce58d02a0b89c064373ea3a73b71e257 SHA-1: a26c8411c579d2dae422a59c31a22d0c9b7120e0 SHA-256: 81f35dcf354a403247e37c4ccf0f9fe58419db8ea8c72556d717591fe70354d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=bocio+nodular+pdf PDF link annotation
    • http://tilestone-pools.com/i/File/woloroleraruputikik.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/sejolilasip.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/kagapafozojebabexuvob.pdfIn PDF document text
    • https://denimder.org/resimler/files/wogagetenilixetage.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/92893361943.pdfIn PDF document text
    • http://nessium.net/userfiles/file/47703428583.pdfIn PDF document text
    • https://tigapilar.com/upload/files/76436364638.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6d5306671---zepidosepavimiraxijes.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0381441d7---99208236088.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e7874248---75431759666.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/natutelot.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122462a3e0---tadasilot.pdfIn PDF document text
    • https://medtek.vn/storage/file/93619183275.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b80e137c32a---9486261611.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/zarosorozabolefubagafavo.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/39924021837.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lexegeripipovadudibatekab.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7e5fe0bcfb08ae82fa84e64a022a6d8f/8117592882.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060ef91a0c1---36730918431.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2795947c3---67276063966.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/xukagotapigi.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/munanemugujowepufulapodax.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20216138719.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eae96bc85dd7a02050cc712ad4e2547e/lulokivegeset.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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 19256 bytes
SHA-256: c18e94f53e6c52e16c116e559e3f9dabb22ebc645937400b4e63d2341fb2d6c7
font_02_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 10368 bytes
SHA-256: b69d3f3caa88edbcf8ef5a9cad59af27b05dcfa6816773f581504fb6dbb0c508

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