Malicious PDF — malware analysis report

Static analysis result for SHA-256 b503441a222c7401…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 04:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 335376424ded72306088dba75261aacc SHA-1: 0b34c3dfc981820ee12be5f032b13efb4b3ae8b3 SHA-256: b503441a222c7401964035b9eed86d117810e2dad5989850eee49caeee7597c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm, with several pointing to compromised WordPress upload storage. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=share+app+apk PDF link annotation
    • https://abhimaninteriors.com/ckfinder/userfiles/files/tasidabikapoxanewuxi.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/xusitosedabifijufito.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022018.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210917120827.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/50685777404.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/bodebisasefogazalumakutaj.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f54920b4---60076782447.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae4cb58c0---48907946220.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/kavowigirukiwodonipuledo.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/92390802057.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/gafopizenemanerobiwazig.pdfIn PDF document text
    • http://houselandia.ru/files/melewajafimufaguvevizif.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/13046917100.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7872d221---86253656114.pdfIn PDF document text
    • http://shosholoza.de/file/daxuzaviv.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wujidusudebofolixebopora.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/rupogawovubekodab.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/72158683434.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/lebunapaxirilogamof.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/16673949017.pdfIn PDF document text
    • http://honda-vo.com/upload/file/80059322563.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/puduzikawerisun.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/45228271003.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/33246239092.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614413825654b---82238832589.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_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 9888 bytes
SHA-256: 4fdbd53532538a008e04041b7aeb2e0538939d7410bc4c9ec32033883b5306ac
font_01_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 17204 bytes
SHA-256: a3ef918c0a91dc5593bb8ebbeae512c380cf2647a3e3a45b23ce0458913fd0d7

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