Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d9c02417e6d2c1…

MALICIOUS

PDF

81.4 KB Created: 2021-10-05 07:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d764c9109d84fa863c0becf19764c431 SHA-1: 557cfbfd4695542a9970f9220130e193d95227d5 SHA-256: 38d9c02417e6d2c11c28f9e7029501644d95b41bc8edc1e43e2c2af8397fb5ca
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://irlanc.ru/uplcv?utm_term=quality+control+ft+migos+too+hotty+mp3+download PDF link annotation
    • https://wineart.online/userfiles/file/15523076620.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/67005597572.pdfIn PDF document text
    • http://195exim.com/datas/files/podexujifijojegid.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/98509053115.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/fumirubogawu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/de1b79cfc509f835ddcf1a52bbe1ac46/popopitiketini.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/14552573471.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/82730666420.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615409cf38fe0---17189865167.pdfIn PDF document text
    • http://01host.ru/userfiles/files/jizirerilojuz.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/gaxevirimevetutofe.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/vuruzarumiva.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/74239796851.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/47356036483.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/40834195367.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/5409330796.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a8fa0b6ca08c7c16e7ecbc4a2ff87cb2/movufupexo.pdfIn PDF document text
    • http://wdnederland.nl/file/gododovagetibi.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/folazukojaderotigetegepi.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/53317537469.pdfIn PDF document text
    • http://hbaoge.com/upload/files/65701026698.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614076abed355---kimusa.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/75703395060.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347d1f7d0ec---73844927574.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/wibadafezozomizetagemirad.pdfIn PDF document text
    • 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_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 21600 bytes
SHA-256: 6741b339a8389498a7123a494bbc6ae342ba5db82fd9caf7c1de98c62340379e
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 11468 bytes
SHA-256: 6fc96afa4e6cdb41f5342595d6224329f32b7ddf1f203ec2ae0fe3f61158b536