Malicious PDF — malware analysis report

Static analysis result for SHA-256 0537421ad938810b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 10:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e97c93da90ee5b8e8e15c536be3d3fe4 SHA-1: ce696b04bfdaa8f537adedfaa96d8b6d516b97f2 SHA-256: 0537421ad938810bfc61a9efe662af0ddb3b325010ce61d75651e7e54e9ab715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing user-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://the-bom.kr/upfile/files/47006458967.pdf In PDF document text
    • http://miass.realxenon.ru/uploads/files/vulolovifalixoz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d01cf15ed81af310e44016f3709899b9/bipilofowisuxonigozos.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/69864048583.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/37689231766.pdfIn PDF document text
    • http://kezmosas.hu/files/file/napanabiwixirulededis.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/seburimafimowumu.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/35907632420.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902191723903085.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96f0f67791649961d7d2309d531f78bf/9277365703.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/xebowadusawu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff78103f3---mufeviguzi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134d09b20c49---kepinukebi.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/forerobiwesiwixojosudine.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/89258570157.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///14386525105.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/gamutodetas.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/pezugasuxekurigizoxi.pdfIn PDF document text
    • http://test-immo.com/file/75751797461.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/boxawidadotajenuwaja.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/zesubekemu.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/79952678719.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/kimozituzedofowupapulasex.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2d551fb5eb98d67ccf36c844eade8def/zitomawikewitipim.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5541b0a4---nezamuwibunabodukizusuwob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gallery+to+camera+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC79 18572 bytes
SHA-256: ea22841c398f9e2a3659febf84102fc72e4e1f9af667528d3ef3811cab0eafac
font_01_sfnt_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 17364 bytes
SHA-256: 48a023a25857e380dfafda813354958da0ae921cfdad4fbfc320a57154022cb7
font_02_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 10416 bytes
SHA-256: 10c1130f1dad1daf0c52ab7f2a28ff8f604aaaffa781931164a0d37344c0da89

Open this report in the interactive analyzer, or submit your own file for analysis.