Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4aafe044ae1950b…

MALICIOUS

PDF

120.4 KB Created: 2021-09-05 02:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a38f07ede34b5d052a5ae8afd49357c SHA-1: f125fd14bb3190d4b3bb90b33f61c677647302c9 SHA-256: a4aafe044ae1950bbeb36af228c54d56a4545b574e5fdf92cca9e46614641aa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeab2a158d---gugonopituzamofunulesif.pdf In PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/pavas.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd7e571e5---70615548622.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/75227159353.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/wikametunuduv.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/52463300709.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/lakagino.pdfIn PDF document text
    • http://peak-experience-japan.com/pipidizopedosapimi.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/78507891318.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/98404861095.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4307094c---33652411795.pdfIn PDF document text
    • http://bwc.lt/i/ragabujojazujode.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/87967298146.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814fdcb5781---7108118512.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01644e083---66083373429.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8odt3al3uklh7gm511h0bg5d80/pumokerafekatumusatevaman.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/43810544353.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7f56ba88a46b94b0cbc2fe6287cb489f/tavakowajinekonudo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/soluzazomarokosanojunoj.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/xazinoxuranafad.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ce4277ad7df03f3331841870ccfb6442/25601605706.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/kuwasunadigoluruwetol.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c146f010f3---77471662886.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543927f5ef---46848944672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2015+acura+tlx+navigation+manualPDF 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_off000173a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BBF 10872 bytes
SHA-256: 43e25e9b6f5ab5e278989c77879755d1ec754327061969db66e2a099d649f102
font_02_sfnt_off0001a501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A501 18492 bytes
SHA-256: beaa993c96d3d2ee118f1f93d7ff7a3f69e683e89643b48653637e18cd1a825c