Malicious PDF — malware analysis report

Static analysis result for SHA-256 103a2a0a07ead2e2…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 02:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e49b8d945804a3386ef5d1078d984582 SHA-1: 9ab4c52f8a7d3ebf0de1c89d566e085bf2d99871 SHA-256: 103a2a0a07ead2e2c02a692a6be44ed7391b57c817891d401aa2727e8c5732f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised CMS uploads and disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=pokemon+let%27s+go+strategy+guide+pdf
    • http://allamericannursing.com/userfiles/file/38068505080.pdf
    • http://bloodfaces.de/attachment/file/4875954979.pdf
    • http://vuonlan.vn/data/upload/files/16084331473.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1a4298f6311e6d43ef396fba4f5abe05/kafufunevudin.pdf
    • http://managhantasala.net/mailuserfiles/file/42749328939.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/zuvedubirujidigugatas.pdf
    • https://alaqart.atelierleuthold.ch/userfiles/files/16805067130.pdf
    • https://birsamundapark.in/userfiles/files/famafuzarobekizugo.pdf
    • http://pokrowce-ochronne.pl/Upload/file/69006235168.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3d68305e7bce69ca639d28b1643f8ea8/96371750429.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/vemerer.pdf
    • http://vuoncotichdep.com/upload/files/zuregowilikivukosi.pdf
    • http://dagmar-e.de/userfiles/file/dazezorov.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfdc8d8234---xuwomur.pdf
    • http://geerhannutpourreussir.be/docs/upload/files/sujekatis.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146619f3bf28.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d525973fa57246fa97e8ff032f03f76a/xizis.pdf
    • http://1000projects.ru/upload_picture/file/73111940536.pdf
    • http://cardealer-space.com/js/upload/files/wufazo.pdf
    • https://childprotectionindia.com/lexcyberia/userfiles/files/ravikaz.pdf
    • http://sartoriaventurini.com/userfiles/files/67069876730.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/3819687670.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a929ff08d97b9cd9053477e3efa07d3c/sebelotufuruguvipe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c327.bin
96ac7063b39da695bd9c17e786cd50f017ad8c233820d79a09c29615082c9381
pdf-font-stream PDF embedded font (sfnt) at offset 0xC327 17956 bytes
font_01_sfnt_off0000f1ec.bin
3ee8016f1ec44f7cff3d07dd9e822f1de7b24eeefd87e494abcdfdb94951352c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 11180 bytes
font_02_sfnt_off00010bf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 16792 bytes