Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa3459073db5f0b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 09:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bbd2733ee54800472d7ce1f1f630c21 SHA-1: 4db38a3428386c166c7453cf0db574015732c03b SHA-256: 7aa3459073db5f0b31dd153e97366af7f80ff55be5d1aa820ed32f3d8bdf6e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

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://akinmedical.com/uploads/file/wekibajudikixokigubim.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74e3db86ba---komorikarijunipibiruwoxip.pdfIn PDF document text
    • http://aurora-c.jp/files/files/wejidoluwi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ocm4v7icdvitv0kmnus42s6gg2/9440682461.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/jedujanak.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/94055690810.pdfIn PDF document text
    • http://vinmexindia.com/uploads/54958670939.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/74ejpoh1cnjeupgu75begbi6u3/ribanidalumuguzumobu.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/gubuleduzagesi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608c84d768ebb---rezokepilagezefijaronixuf.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/jimitudisetuvum.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/mokunokekozarug.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160894c84e6725---45383995174.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/snokqtl2t5hdikdf5oi97f4fu3/51848900735.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/oaov4qdfqql7h3tkbltv98f16n/wadarerupovagog.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/97529710877.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a1bea1352ae8d4bb9bbadde059678b86/kezifijuzavovarotanuroka.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/27d0cd6e8be128469a3b4a3820499d94/99791441222.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/jafukubafisovoza.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972467258e5---21894509125.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/20720950452.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f3112e1c818eb07792e57aca054c30dd/97424242542.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/9d16f17cc1ac53e1ac0b920e0588b138/15867941754.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108241111374554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=microsoft+sculpt+comfort+keyboard+user+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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 11220 bytes
SHA-256: bf43903fb6d539ec646d01c3007bbc7a4511c4d7f70ffa6c7dd08545552accc9
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 17616 bytes
SHA-256: b50a8ef88ab649386d7b76fefcefccd75ecef4a40c064a0f349fe552dbf53afe