Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecd4f1ee99a6c4b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 00:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb4d0f090b4e92f17728b763f97d760e SHA-1: 32669cf9140d543c1ed68e78eb9d6b344f3f43e7 SHA-256: eecd4f1ee99a6c4b6b438a14d894c594dc38400e00bc799bda14878f07647d48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised websites and disposable hosting domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=software+to+view+autocad+drawings PDF link annotation
    • https://haltia.mx/sii/ckfinder/userfiles/files/poriziduzaletobobedif.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/68164474397.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc957cafbd---wunepejinixewumed.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d42a909e10e7b6b70f9b7781557e784d/57262076301.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/depiwilakekemovij.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/bed04871323b847de02a65d5360e89f8/sawakakojubebivo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/44697575118.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a0861a714e5646bedf7411c3f0fa22f4/mapofelejerefaxasejom.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210604105704.pdfIn PDF document text
    • https://afayl.com/userfiles/file/45623281188.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/vojuku.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9148c7ae31---79991116545.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37b5d5701---xezefasavesuzaf.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210627_41A9F788EC162C18.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/zakivovawabina.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0955b2b73---35529543374.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/196d931472ade36eaa88195cc72bf1cf/8107052022.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/88h75h1jjqbpb60h01aer70mjj/11835858478.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/votakuxe.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627803838_1.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/rodopogajalobata.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/jenixelaga.pdfIn PDF document text
    • 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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 18372 bytes
SHA-256: cc10f5ad379b979266a15c605dbd283d5e461dc8c4c24863c30f00e5d4d419f1
font_01_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13990 10932 bytes
SHA-256: fcca2e6f3aaf1c343b2b038dd6fac869d4f63af3f21059d8bbc8e78a2ff8bf49

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