Malicious PDF — malware analysis report

Static analysis result for SHA-256 3812f3554cecd97d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 05:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bdd8e2e04d93dde1a0c9ce21276819ee SHA-1: 1eeb6b7f95b4359ff855081d31fc62897d9c6b84 SHA-256: 3812f3554cecd97d60119bde642203d5889b5769205d6ef8005f25735e3d5aac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF's structure and embedded URLs are consistent with techniques used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://seteo-dechets.com/images/file/70926749913.pdf In PDF document text
    • http://gachmenminhchien.com/media/ftp/file/muraxederufajuma.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65b161925---19391288427.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/768a78a23a214e04af1ad2309fb6d231/wurenovugu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/474b52446907a0edf56bac6627fbc903/47727508505.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/83817524675.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/svakas67utikqkvs38v2106rnp/57515082218.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zugowunaguwelatikosaw.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/34874570382.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/pajidirawirogekamugin.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/63c231bcfaf3263fa91955c91489a576/vuwedud.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429180347152.pdfIn PDF document text
    • http://ibb-online.ru/f/file/febora.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a677dd5f396---refabudowirud.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2f7cb9adb---39883541482.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/97467926864.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d51b6c35f3c---639526653.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094520bb242e---31755322409.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/96328497105.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f80f77c232f34332ce51fd1f24530550/vozabuvijog.pdfIn PDF document text
    • http://protok.pro/upload/files/moxebitukusa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a67627ce6---zelunolufupuvedinaretut.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/34792448394.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6980bb4a---wisesuxepadirogebefan.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921cd8daa8---mutilumamizoveni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ep+church+hymnal+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_off0000c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 18168 bytes
SHA-256: e068fdddd9e70d7239a969ace93f27b4adc2453b72a311bd6d1941b613a53fc9
font_02_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 10472 bytes
SHA-256: 030cbbf05c2b0abc546c100a3ae1da58821eed73bb54393cfed2739bc5be956e