Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d277d4e32c431d…

MALICIOUS

PDF

92.9 KB Created: 2021-09-11 04:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 873bd9f3d5b5f011aaf70af297ad6543 SHA-1: ac4c326fd68f47c0b36f8bca6dea0008291a9992 SHA-256: a1d277d4e32c431dd3a17ed61e275c9869d996fc2d22ecc80d7a004c152b0b43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://krisoc.ru/uplcv?utm_term=watch+my+hero+academia+season+3 PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210906_190527.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613319f14e487---58447569951.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/gafemowar.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/fulakor.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xonuwexapev.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/31546974109.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/kisudiweb.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/19629563581.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/gutususipasinexiv.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0349f33fc---sisakaruvowijafigigojoreg.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134caf312e26---39321621775.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/9703388204.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/vamawafazatobuwafogupigi.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/23557614704.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c63c1d534c29567cbf364a6eccc60eb9/vabepimolivafemabidedaza.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/3douuh2028ksj3arhvfnostm10/divotajaza.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/polizujeri.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/28870110091.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4bd63f36967bcf6018aaefe5f499f3a6/89735447456.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/2870886028.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219261425526.pdfIn PDF document text
    • http://forti.in/userfiles/file/gefiwurexel.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133d10cde572---lajagovijidekedinoxupar.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nesugowejubuzabofob.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/80939655416.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 10868 bytes
SHA-256: 8f8cfcb5bb74df75f77dcb80a1f09e215904ceb13c3eab43ca50364480453f52
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 17416 bytes
SHA-256: e02512740206d78686bb336296e704bc9ce6c8d6a46f2390c8cca8d8d9442251
font_02_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 22236 bytes
SHA-256: 423d3c3ce2345b883b3105ee23dda436b976967c61c7a923bae69b5cef0a1970

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