Malicious PDF — malware analysis report

Static analysis result for SHA-256 341f1589c2237117…

MALICIOUS

PDF

119.3 KB Created: 2021-08-09 16:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53543766bf96acf0114ae2e183d91a3b SHA-1: 19582b91d3187949f366fa9a74df4b0546609db1 SHA-256: 341f1589c223711750712b62dd0d278a5d9ae39b76289b0055cf04243f09e4d3
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely serving as a lure or a distribution point for further payloads. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely related to phishing or trojanized content delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3704

Heuristics 6

  • 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
  • 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://allytemp.ru/uplcv?utm_term=alvin+and+the+chipmunks+2+full+movie+dailymotion
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f82db58e11c---42940811883.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qaon8kk5rm72jb9ssfmtj5tgtd/tebewupiwupifowa.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a1e30bdf683af3c9ba488cae3769cdf6/mavonerirojob.pdf
    • http://hourinkan.net/js/upload/files/85742539896.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fu5nfjfmmtvcvs9mstmhkho238/danirerakesepifuwosonobez.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/jikelezabogexutu.pdf
    • http://arslanemlak.com/E/file/44001712540.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/95its95qrfciknbbonkm7sc6lq/kixazuzik.pdf
    • https://nutricount.cz/UserFiles/File/tuved.pdf
    • http://asckhn.com/acskhn/userfiles/file/93701344939.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2c597c02e---jokepogimoletixu.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1df719c182d75c1a6e8535792b064a6c/datobabusakaduwisudorel.pdf
    • https://mimpishio2.net/contents//files/75447796711.pdf
    • https://eslms.com/userfiles/file/somasaxegubadewi.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/10592771612.pdf
    • http://guoyangmoju.com/userfiles/files/31362249589.pdf
    • https://bursakaynak.com/userfiles/file/7748933678.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cef651cf01414b975642af98c640f67c/74203549821.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8c2aaf76---rixerizezorosakug.pdf
    • http://fanti-fitness.pl/uploads/assets/file/jitid.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210603_193444.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/96e6f26fa5238913b36f49bd4fdf4822/zifojuzigepuwajafubu.pdf
    • http://autosoftware.company/autoresponders_images/files/32022475736.pdf
    • https://sbmhavacilik.com/userfiles/file/fabixupesot.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019cb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19CB8 16792 bytes
font_01_sfnt_off0001b4cf.bin
90b7d4c721091a253a728ad746d79e72fbd1c4657c476235f3687f62fc688986		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4CF 11260 bytes

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