Malicious PDF — malware analysis report

Static analysis result for SHA-256 2784e300f0ec0c4d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 05:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a627df0c9baddc04a83fa5d0cbae5199 SHA-1: 5c4c0e167c9b65bc6d6128ea6c48e3122a5f77ea SHA-256: 2784e300f0ec0c4d29d65044eaade5b32628d5a5c62659adc9af605a6dc4bfe2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of embedded JavaScript, though not fully analyzed, further supports the potential for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614204bf011e1---lanov.pdf In PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/xazasumukirovab.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/dejufurafa.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xiwobuziwuxifazux.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/33782397347.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/rukadixemamedol.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/viropenovekox.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/59977895989.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nirasatateg.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/notomopamaxo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fa6af8dc---baxipoxari.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/75984650351.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/rerozigoranuzodejulif.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/zanewu.pdfIn PDF document text
    • https://photofetimages.com/torekipajukamu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3f500bc7a684181882e7ca0c4243d52e/tineriziza.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/jisonomonozunovobaroko.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142cda6504ec---rujomubivagolegukevilufi.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/sotug.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/67549908499.pdfIn PDF document text
    • https://austarpharma.com/upload/files/xedor.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/65308198770.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/40485208974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apk+for+free+fire+maxPDF 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_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 17400 bytes
SHA-256: d16b385906d6c32e7838067c14a008025e6a8153c79712a52d555820f3f26bd3
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10276 bytes
SHA-256: 7533d714f8c6576110d8644cf7edea42c546e94a173548a364365ac944d1b411
font_02_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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