Malicious PDF — malware analysis report

Static analysis result for SHA-256 b177406cac622db2…

MALICIOUS

PDF

90.1 KB Created: 2021-08-18 23:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ff395dcf9996e9b05c09ffc025a9033e SHA-1: 19adad482f7b1e99524b488c3bb430f697c2137e SHA-256: b177406cac622db25995376db09d10191012bbad12b2a1b252b3fa42c7376690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944909e8d7e---vaxupu.pdf In PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/pelezogax.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/burevalujazegasugokoxa.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/7717864867.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/61716940536.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nisizizanazajisi.pdfIn PDF document text
    • https://eniedu.com/data/file/20210807011347.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/zotuz.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c6d693129c531d00a630b9b456b44014/36264394138.pdfIn PDF document text
    • https://eventaipei.com/upload/files/46627480577.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c974a6f019b---jufipu.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/38042987168.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/vanoleninapor.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0ebf2a1e40ee5d8369dd4d704db3585d/mosofapaxafulusa.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e7b9e1cc69d40675d1ac98d454e4b6c6/36383896434.pdfIn PDF document text
    • https://jambumanis.com/contents//files/31923208775.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/buvotisimarifumowane.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/19886116807.pdfIn PDF document text
    • https://birudongker.com/contents//files/kadorumexazapivoxu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f16fd2185---siwasojoruzitejexevotopi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8etbedmfh902ha4q6r47demj09/81733675125.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/wikixerikusezigix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+musica+mp3+gratis+para+celular+genteflowPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b3a2519e5---76756171439.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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 18348 bytes
SHA-256: aff553cf8a74d675187f6b8374907391e7d1125353d82a291997eafc4120f0eb
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_03_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 11184 bytes
SHA-256: b75aaea9ad9ba006c669326425624a0275fcf7283d1efdf775ed156d9fbba161