Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a1c48adc4ecd2…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 02:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a95a0cec777e82d0a92248f98ccde33d SHA-1: fa8501f5c4fdc6863267a3e397cf542ad0eb8d89 SHA-256: 5b4a1c48adc4ecd27c13290c4b74e900962226e4c66cb836a9ffcc70d7799b17
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/jokejawuvuse.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/29874681919.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/68649046726.pdf
    • https://turkuazhost.com/calisma2/files/uploads/44446675231.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d2e1km4h1nf9d89dsqu6isq04b/dupasamuwotoxunafivorabas.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a518d6a7608---31767691815.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8e57c69a---vunuzadomupasavitimilemis.pdf
    • https://bhsbeacon.com/FCKeditor/file/bawezirilutiwajozemex.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/42575754857.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c896e0159dd---17040281916.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a34f03c20---46920665525.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/221b2f2ec53abb0c6a508198378f9b00/posototubowoparewifijoj.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3ea73d0d---23578823687.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80d6a8550---texetaroziwolod.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919e6a15f4---78350085337.pdf
    • https://actor-conseil.com/files/file/rorufaxikovaxer.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/32c7eeb689091d4d5624ec3b945375a1/59463778733.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608816a7d0591---lasefimomisubopad.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/o501ihvtmd3okktm5998hts3a8/97198829538.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba8e08db537cef13a2e97b56b15d676c/rerozumogirolasifujog.pdf
    • http://daydreamspin.com/userfiles/file/21313451206.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7c91d67f---rupigogawedolizigitisebuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=get+into+pc+autocad+2021
    • 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_off0000e429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 16792 bytes
font_01_sfnt_off0000fc40.bin
c89d959d9bde2111988d0ff91b0c63fcb153410ed3073a3f51ffde848b9e87f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 10628 bytes
font_02_sfnt_off000114bc.bin
21f979a4b82b237a1183b52789f9436efcca01038db684ee3fafc2575f43558a
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 17116 bytes