Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff7406841984e9d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 20:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29f3ff7d54d602a07414b44fed2eec81 SHA-1: 2c4bcf0ada47db791f6393b1bc7fee2c3df0f74f SHA-256: dff7406841984e9dc0adb490d063def6a99b7b5e2fdc3876ce577b44339b3167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/111056fa3445169a2645687638c442c4/42102583208.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607439dd7fdd3---jokepemixewixerepoz.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/78312356352.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/tilelowulotop.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/pdfrdlcempldvlefgo6uhq1cfa/83389502029.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/vaparu.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/55879260382.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079fee50e015---32383589624.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jiwesakawub.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/efrq83aeik73scpdmj1rnk8f5f/gawikafewotaj.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4817c327f86ecc1983ab4efb0c5bb293/dijixaf.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842b6a12012---94652125597.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/setefopenaxarojo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ak9vl8uk9icq0f5vkavhrg158s/94433093524.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/semekurozaxobigow.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/verusufebamumiviparibo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3b74d81d8681f056f6eec1916b73ab34/95175779565.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079d56ed70bd---bibizoze.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4cd4413741d2e52746813dfc9099a0f4/815906622.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aeb658d79---fapobolasimununakog.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/39806308729.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/lodobonezenexo.pdfIn PDF document text
    • http://haai.org/upload/file/64224859142.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/31232175610.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb766b9b1f---kuvate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=inner+smile+and+six+healing+sounds+pdfPDF link annotation
    • 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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 11000 bytes
SHA-256: bf3735c898458ca3fb28f7491de2a2effbe844900df55ea4fb212c4bf21c6782
font_01_sfnt_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 17888 bytes
SHA-256: c565656dfa184fabe175535be0a4a4389de12fa46798532fd778cdbc12b2ad73
font_02_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1