Malicious PDF — malware analysis report

Static analysis result for SHA-256 640f32f491173a0f…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 00:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c194160df924fb9fc9d7915497535db SHA-1: 26e159bbc502f3adea0cbf619dcb2e341792c7ce SHA-256: 640f32f491173a0f385ae1e8558584d6f600b7a64c7b81117b2ec38d213ec5a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+to+set+an+hourly+alarm+on+android PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5a5accaf0775f6a4c09d986517060f31/32395275204.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pazozusajuxomifuna.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/42801570814.pdfIn PDF document text
    • https://coevent.ru/upload/files/maxuduxakuzitotozunulix.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210903_8AE389C502A6C400.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/dofosukoxuguxadebapizeni.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/84971125401.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/nixixitejugedu.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/23941448451.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/bisawif.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/phhmkfo0015h634qrvbtce1ms2/200567957.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/tezor.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///winejeguvev.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/36255652489.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/70337206763.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/5574486634.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/fatab.pdfIn PDF document text
    • http://www.moyekolodin.com/files/razifofuj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153dd7205cf0---bofatipasonubo.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/65411843773.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330bfe4057c---maninirivapobutazapaj.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/dofoniropopexefogiruseta.pdfIn PDF document text
    • http://czminghe.com/upload/files/tijanabev.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/raluwibomo.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_off0000b1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 10804 bytes
SHA-256: ca94da622c023b8a9700f0180248362835dbb502c6ee6387b92b05c948fe7eab
font_02_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 16256 bytes
SHA-256: 3e25238ec8f38ab332adb37e11e4156d6de0b25db6f2b46f61c2318b9045b4f6

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