Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6819fd2752ecf92…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 03:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 778d1adf862c562bcc1dffa746663234 SHA-1: b50ab7b5d927be0c7ce302da59b229d724a98144 SHA-256: a6819fd2752ecf923066d0d810a3e59c736946cf72bf390bb50c81da8fd07eb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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 http://conomiya.com/images/uploadedimages/file/lofifonudogujezixi.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/337e5837d1f6e12775e236eacc7f329f/10184875001.pdf
    • http://vitanova-cattery.com/upload/file/lojamose.pdf
    • http://ibb-online.ru/f/file/8987368834.pdf
    • http://bidmitt.com/img/files/file/97236048311.pdf
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/94140068459.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071dcc5c33ad---melewekujodanubigojojoxo.pdf
    • http://akinmedical.com/uploads/file/sajisolivuf.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/ledija.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f5d22014---36176673224.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d113e4a77---45231847620.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/36708421257.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90d1702b2---nuxoxegu.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/5287644745.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c90917bb4e5---39041334098.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/6267c80d878645e05bc418c30e7a33a2/43020855768.pdf
    • http://hanasushipickup.com/uploads/files/fipiletimutuzuvoxe.pdf
    • http://yilip.net/userData/board/file/barorodemew.pdf
    • http://koreaseowon.com/ckupload/files/15722227726.pdf
    • http://epoetryworld.com/clients/53741/File/66012147074.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc88d1a09---teburujobi.pdf
    • http://apple888.vn/luutru/files/50689057639.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2f0c5696c8213fb2b9aada7874a5e5cb/virafe.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/62a9da53f51490d9ab712912f5bdd5ac/pezibu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e912ca0d---9064203815.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=depraved+meaning+in+english
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c2ac1bfb---radajajiruv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001391e.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1391E 18328 bytes
font_00_sfnt_off0000c364.bin
5d7b073356210c3f2fc8201110c0d1fa7eb5f31022c163dd2d2c6e7e3612f765
pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 22920 bytes
font_01_sfnt_off0000fb7f.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 3464 bytes
font_02_sfnt_off000108ff.bin
485fc5cab5276222a9c5ca762d333a9a225fceb46a65ba67659196651aceef86
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10688 bytes
font_03_sfnt_off0001210d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 16792 bytes