Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4ce26cb178dde9…

MALICIOUS

PDF

79.1 KB Created: 2021-07-04 19:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6c62ba05c666c01cc273af9d0c5b32f SHA-1: 282b870e24a87aaa02141cf77ecf4c7578017ba5 SHA-256: eb4ce26cb178dde92411e42d11e90ea630ff1ef14824bdfd4f64410b01d9076f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted from this sample, but the extensive link farm points to a distribution mechanism for malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nadiadsa.org/userfiles/file/23672407209.pdf In PDF document text
    • https://bem-sa.com/img/file/mizatijibeweji.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/zudipolijobulakis.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/28754485548.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6fd7b320837020653c2d3d49dd9cf549/rakuvewejalasotobigitegu.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/pudenu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9f0ab79208118e54b73d403b77e049f4/33465240806.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/memosumojufimasu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zadobarabewivarodikub.pdfIn PDF document text
    • https://webmenuplus.com/images/file/88448299216.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/63817490200.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4d0a63c4b359111fa4889c3380e46e13/29183379631.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/09322220eb011f91e09a738dafd44d6c/44070378080.pdfIn PDF document text
    • https://morabia.fi/images/file/27978114773.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/82650703728.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d898b9e3e---nitamovasopepunidizolam.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608372ee90564---zajal.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5d5e991f33f64327bf95e3fd031db4ec/62438317073.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/t9tu4a1ni5ksh57pgra369ndv0/balosifo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc012f70b75---wazaximibonuv.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609762a2bb712---xokevawebiwejuvoludone.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0a8q9r1cg74dhm9qm9g0l2qkg1/wekipifoxofadijomen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+does+dp+stand+for+in+textPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/togibodazuwu.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_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 16928 bytes
SHA-256: 5cf37312ce059ee4de748b449e6344f245f806229b627dab1640dee86a392249
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 10644 bytes
SHA-256: 7be4807531328bd75e68f5c149efc81cd18d46d508543b0c61cb88ea06e0934c

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