Malicious PDF — malware analysis report

Static analysis result for SHA-256 6590a390900213ab…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 14:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21cc402cacd41cbacca64c6389e8cea4 SHA-1: fc62e69a631bb8f02bd8128f3d171276791597b5 SHA-256: 6590a390900213ab2220c1f84cc67db521444c960960c7c31d3a4a76ac532abd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dunajecbiala.pl/upload/File/dusafizu.pdf In PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jidul.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a431fb39---gavitobowudufajig.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/14014608275.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gm4j1i2gd263233etuabtttpc0/lavus.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210616_133158.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/zorofubabi.pdfIn PDF document text
    • http://iworking.vn/uploads/files/30588564732.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/peu2pv5o213mki88gs98tfqf7m/ruguxufotogutoru.pdfIn PDF document text
    • http://fotossc.pl/_files/file/68237855275.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09058b0a1---63118276511.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c7b2883d48fd1c4572b74305fb115e59/xinabuvejivokadoku.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/radobixu.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/wowone.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/rovit.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/34c30602d599506a9919bc72726672c2/lejoripedibawed.pdfIn PDF document text
    • http://pasted-radio.de/web/files/5481373186.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/20219864240.pdfIn PDF document text
    • http://placc.info/up_image/36558015801.pdfIn PDF document text
    • http://terminsk.by/pics/files/sizazonidujivugo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06977078cf---gadovijupibuwevalepimap.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/lisedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=inorganic+fertilizer+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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 10636 bytes
SHA-256: 53018ff60386826f5e4a673234dd565062f016c4ef68a404daf8eea6b2f8e22e
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 17260 bytes
SHA-256: 80762ff9ac7f84981f5bb47e56e28b36b9971f553a083a816f43ccf8b0667510
font_02_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1