Malicious PDF — malware analysis report

Static analysis result for SHA-256 d988c8d5297e56cb…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 05:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23fd039dbadea28eb4618e48c7ed1021 SHA-1: 345b53456fe7e3fad4fbb96068ba8ec29a776103 SHA-256: d988c8d5297e56cb6d6aa534e1118bda0fcd34427b9a100adc1abff4efcdc6b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and the 'link farm' heuristic suggest the primary purpose is to redirect users to malicious content.

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://mesahighclassof64.com/clients/874441/File/42208424126.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160811e83dc528---75551453767.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/vugututipunip.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/68048053250.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210828035235_1810379417.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/55080617905.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/nutajitowiloxojetudita.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8025049227---32935175319.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/81644014080.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/kitun.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704319842ab---92401343546.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/sotoxunutereminenomigiri.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcbc1e888---malenalusoriwosisu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/128lgi9k1027fjak8lf0apkfm1/poligaro.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0uu506gb4md4l7dafep6g9sg8q/dudufojumorudumiwesa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cc62bf77d---10676753942.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/tedisiwejeg.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/xazoxoze.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42e9696defbc374a517c8b6699e16158/58782374455.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087594b4b1a0---28608348802.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/78083693019.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/padekiwinap.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/muxuzegizutaru.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/jukr4v5kd981iqrc3quvrls3e2/vumutekedezixub.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/barijez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=modern+surveying+instruments+ppt+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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10908 bytes
SHA-256: bf429f3707539cbef73f3b753e2e855fadd0aebd5286ea25f610d3e244801c4d
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 18276 bytes
SHA-256: 483935fa7b9954b347026659f79fe68311536c5364c7cf30062090e8137d8937

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