Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5d340b948862db…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 21:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0006f3b1fbdfc5d2b95c33fb39d9b044 SHA-1: 43f096752d6490f50eb952813ca9f472e8e7e344 SHA-256: de5d340b948862db7ee0436a8ddecbe7522e19b455f3c9fae1c96856988b0b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards an attack pattern involving user redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=khasakkinte+ithihasam+ebook PDF link annotation
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/tosupilop.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/13854328169.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/92916172293.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365615c2531---latezere.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/66577026710.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/16883513012.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/6471625960.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/rasololeve.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/49727811661.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/pofavejez.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ec3bd03e6---43618844586.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/fawuken.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/jowonoborimogegojepinux.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/62742316479.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/zijewuxogoxigosu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ef8ead80318d8f8af2978eea04b8e5a5/nobisudafunakolozosawa.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/rulalefabofejapejibapux.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/93536585303.pdfIn PDF document text
    • https://n-tlg.com/files/file/49877269660.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/70050612847.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/67f1j68u0gaaesc22pa82br6r0/javejabi.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/rebukikibulufosurulu.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/dinoxabuteboz.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/15829235685.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff66834561---mowakenepebipapibe.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/lisujanakop.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_off0000b5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 18436 bytes
SHA-256: c1a6ea1539e59f7f351924e7d559d42d5cf9f375e525ca58d697ff47bc8809bc
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10452 bytes
SHA-256: 55f29290fedf27e3ec1689ca3673f0700fdbd501160cb45c3ad1d8713c70bf66

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