Malicious PDF — malware analysis report

Static analysis result for SHA-256 71150a579e6e85a4…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 07:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcd0039de75bc650efee68100b6361fa SHA-1: fea1d5cd4959324c7e7b39f9e50b83d3e67642c6 SHA-256: 71150a579e6e85a4470d2ce2b5050506f5efa0f383344f57d6e00514e73c0b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7a5454bc---fozogex.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/11186749353.pdf
    • http://albino-pitti.com/pub_img/file/84911326109.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e6e4ae6a9a5ba52130735cf3e3f0805a/pipoxosopokipefol.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/564ad35b5906830f1627de541d20ac84/mazapodenewijilufonimij.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/kuxadokatufijupe.pdf
    • http://getem.eu/files/file/texoxegovoretupifawiv.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/60161703863.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942f3e29fc---53517280549.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/gigidamikur.pdf
    • http://paradisoseminatrici.it/userfiles/files/fukugegi.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/jedefegedijiminojiretonu.pdf
    • http://altinay-law.com/images/file/sozeresesaz.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/54357895028.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb7e0dc49---37716753246.pdf
    • http://kgmda.com/upload/files/47413911500.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/makud.pdf
    • https://fceresources.com/ckfinder/userfiles/files/bikomenifojogonodofax.pdf
    • https://travelstore.tn/userfiles/file/zoridezepirugoxumafo.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/p616krn7s38uo91jf4gkvmhvm0/samesuwiwameti.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f2363c8f---33739804964.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=i+love+her+more+than+anything
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f491.bin
aeeb5f10751a2072b434529d3fdcc3f11ad3c4f0cdeef1134a0cc6367e24056b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 17360 bytes
font_01_sfnt_off0001216b.bin
39b7c1655e446b7bfefff7fafaca558b75163632b9fdb4d5fffe69e65dc7dc6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 10520 bytes
font_02_sfnt_off00013937.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13937 16792 bytes