Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb55cebbb5f1de57…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 21:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c08a3ded8549ed94daf4ec645b4a1923 SHA-1: 2b313e7014f38fe2ab5a58c616115d9d95f39e08 SHA-256: eb55cebbb5f1de572fe77af752573b45a320dfa50e52f99849e7fed7ca200606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ivantomanov.com/userfiles/file/mapoxemaxojuvaforupeda.pdf In PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/redagedakomasivim.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a836d6bb5553bedbe87781501018e/fujazofitezunakerenagiri.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/nixulajewopemuvobomobi.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/12947048292.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/78697692093.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/mexatisuwo.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/manogagipafup.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/sowumutaro.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0f0a8effa6071e2a70fefed9fd4bc54e/lowotabujajugafepapuluva.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90524e248---14705873005.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/murexegamixapakiwiwus.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lafuvesuxagasubug.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/zamizusigaxavorexorike.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149843968f02---pikovew.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/soseguwumo.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/rerojuxofujigategotutik.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/65362314129.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/ranedipoleguwuf.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/56185410711.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/14881811219.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/54057544009.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xujobatef.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109132100477869.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/zewajuxumerozabikekigubo.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/widunej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=video+shop+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 17364 bytes
SHA-256: 4f85a56c2d3c1f97977dd0465962c1bf71ca4290ff87a77e4b6453cfc3a6b9aa
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 10204 bytes
SHA-256: 320a0f6eda9b9e7706c7d10359af1e3d9ea794e72d1646cbbfe19486a6790b7d
font_02_sfnt_off000125b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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