Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb5afb7edb6b65a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 08:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd750a91546c298612573954e452f4af SHA-1: b2784d2880ebbf0261a7c80849f701dd88fb51e9 SHA-256: adb5afb7edb6b65a4a1424c55f65bef9494792acc8d5e8a371165ac46715f113
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161360bd4a877a---tuvujetovixawexe.pdf In PDF document text
    • http://hoangnamjsc.com/upload/files/fixikepiwivabexexifi.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/lopaxaxew.pdfIn PDF document text
    • http://chinahongji.com/d/files/66035584126.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911043334.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/96362140756.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/96189637487.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/29956538035.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/44907843051.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/27395689817.pdfIn PDF document text
    • http://rsst77.ru/upload/files/70375304084.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/44581784429.pdfIn PDF document text
    • http://ubest.ru/images/file/93425249889.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/23103758833.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/8145064007.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vubakudaxetivomidimigu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a3cda5bf7a946e1ef0dc02aadfd7723c/ziwirapurut.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/31c9033799f912266b389dbd118f6982/27536252005.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/97480394850.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/pevijozelife.pdfIn PDF document text
    • https://drlanda.hu/user/file/novokemiwonuxigup.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/51856063233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=online+android+emulator+with+play+storePDF 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_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 10980 bytes
SHA-256: c8864f3b1589841c2d7a687b55942be014a7ff6b0219a6566a7ee6e49d27d22d
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 17708 bytes
SHA-256: b5747de44e84bbe2fecb55cd50d3c8a5497e9bb87f312e09ff74b37f257f8bc2