Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3161508b6d0657…

MALICIOUS

PDF

83.2 KB Created: 2021-07-17 09:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ec18d3d52c66ba817ae22daeebba6eb7 SHA-1: e35a2374fa74715273cb31c760874bdda008dac1 SHA-256: 6e3161508b6d06579d1f06bef3c06950bbbfcc47c77e5ee18b9eb1b7a38d4496
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files hosted on various domains. Several heuristics indicate these are likely compromised CMS upload locations or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://3qlohas.com/CKEdit/upload/files/fakinedoxovixuzovikorusir.pdf In PDF document text
    • http://gptools.net/userfiles/file/pazexaxumidusitizeme.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/653fb0f2f0598012aa73db97f1989c87/56163606363.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/mijikaxisipojoxadatu.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/getuw.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/31351977406.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/25245082930.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897ebea6661---dejudasoku.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608e832c366db---gavumixip.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/97367905090.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/24548656383.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/75c413307e54c1a4b7baa5e2d60f7a15/68972024936.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/debipuzosepamaku.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/10695022b9aba399e2a10e8b14fcafcc/difixatofotonixiviremur.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/rokepizageloniwakuvaxiwef.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/megedu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0263dac8---64413660106.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160734c49d45aa---56620930353.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/jalawimuboxewa.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed07739524da2e1fa5d76abcd03a175d/meruvetewadipuzive.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/madexelaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=whip+crack+sound+effectPDF 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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 17660 bytes
SHA-256: c36d608d83606f6106eb2b4a3aaad4191e02be9f92dd551c6223fbb35e5427b9
font_01_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 10856 bytes
SHA-256: af81a25393e0677e7950ef7c66f1fa9b4ae8cfb0062470e9b85e498b0b9a7c05

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