Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac69ff530d98a20…

MALICIOUS

PDF

85.4 KB Created: 2021-08-29 15:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c27b9a7a17fb24bc7a2cb585176a0e3f SHA-1: d8e7e0fdc27277bea0c468d5276f6ddf66a55fbb SHA-256: dac69ff530d98a20a9b341745b576dc6ee646aebd58973cbfe4bb4f19087452c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which are WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://petrovsky14.ru/docs/files/lolepewexironi.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4227aa526---704869790.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/65etl68uoohjg6b42j2b82geg9/rusipuxisozox.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/wezugite.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/viderimakibupedet.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4jc1olsfg845gp9nmvhg8nl790/5032830612.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/fikom.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c5f42e8083c3f27c1d1bf5394a87e3d5/33100960718.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/mupoku.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf8965228---jobomaluganefeg.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/begesaxabexikadofililom.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084305fd6db2---berukemawobasadi.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wofaranafenesatija.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/15492435599.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2bef6e526---govefit.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mdlk94vpspdccsvknv6m780q72/rejebo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/zabopesu.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/30225365986.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/goxez.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/pimixagesebolebixosemuf.pdfIn PDF document text
    • http://khmer24biz.com/public_image/alluserimages/files/86310679196.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/tibevataraxoxetapudal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=polio+drops+from+which+agePDF 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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 18000 bytes
SHA-256: 3a32cf977fa180988197841247e3340327185872b685f0874f015a00789591e8
font_01_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 10952 bytes
SHA-256: 16ae31e53e9b2aaa78731441c2626e7d4cd4b55571f116a3f297b181a79dc702
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1