Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fc572a08f8cd15…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 12:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3cddfa500d373c71dc7eaeb77bee81f9 SHA-1: 4dee05df8ec614fd87d0c84075dc73f968127276 SHA-256: 51fc572a08f8cd15b2283245f68077a5933e780bd4bf0a0c0b403f06140fddb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive means, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medvor.ru/uplcv?utm_term=tremblement+d%27attitude+pdf PDF link annotation
    • http://allamericannursing.com/userfiles/file/59113941715.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/df6fe617ff66d6cf3cb05aaf16dd1877/bidevinuloruj.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/gojozevedij.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/66551007750.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/45035460394.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55e74fe1a---99128748223.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/61250171700.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/81467763331.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/87946717725.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6icc0sqvls2jfg3tvg8ucpqsi0/89562229892.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fufenonifivurinuso.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/kofizirenebubopukan.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/20327075676.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/26747976734.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/83776936234.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/radimulajuga.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f02d1cf4f9---pilasepebada.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/79980701700.pdfIn PDF document text
    • http://skisun.it/userfiles/files/27917350134.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e25c6b6bb8b54a9d68be42a163dd9e8b/23402099057.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/da985c27b0d9c3d7727b8db410dca869/goxometinizemitufuxize.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/7562292671.pdfIn PDF document text
    • http://www.asslar.de/downloads/22380728978.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/20963193208.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1dc29c7a8---50701406403.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/ruliv.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_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 20064 bytes
SHA-256: a1a2dc4dae779a2c6d8c2b77a85c04efb736cfa2938ba0df6689bb0717d5b22a
font_01_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 10608 bytes
SHA-256: 6f6bca684bb059b82efda2f9783b143c48d53e407648a4c2b2a04b61fe1e6977