Malicious PDF — malware analysis report

Static analysis result for SHA-256 08aa0afa49cfd3ec…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 05:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26e5c38acfd5c4dd37506424d92a01cd SHA-1: 2c99421bef0c28546c8fac53e3cb984ddd19b373 SHA-256: 08aa0afa49cfd3ec0f84f21426c68319a2931a53b89b72206af54d3b19afb7e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF. The presence of numerous links suggests an attempt to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • 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://queure.ru/uplcv?utm_term=igcse+geography+notes+pdf
    • http://diegogenna.it/userfiles/files/fivexininolerebaxumex.pdf
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/zuxag.pdf
    • https://birudongker.com/contents/files/bezasuzisokinuvifokob.pdf
    • http://crmloccitanecr.com/campannas/file/35433843763.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248906e451---35429155761.pdf
    • http://clarksville.net/wysiwygfiles/file/19854694972.pdf
    • http://tornado69.com/clients/40643/File/3500939368.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/3002688997.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/2567579969.pdf
    • http://donauwell.at/userfiles/file/fuxifo.pdf
    • https://gabconstruction.com/ckfinder/userfiles/files/84113711019.pdf
    • http://maksimetall.ru/files/42012537555.pdf
    • https://thefertilizerproductionline.com/d/files/81556698386.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62b0a4ed32---nikevetababoporaposonu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f0d524d4---64175459962.pdf
    • http://myrbacken.se/login/ckfinder/userfiles/files/befunipegekow.pdf
    • http://apogeeconsultancy.com/upload/files/zugoxilajoxerexebu.pdf
    • https://beyondpins.com/calisma2/files/uploads/kujapikon.pdf
    • http://lsneotek.com/ckupload/files/misev.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1f8b3036d4bb368394c9504454808bc1/2548175853.pdf
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bikexosise.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610818893cbc2---nemorokatubovuguse.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/11e6ff4c6f63c17eb174a424cae93721/12478157799.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f1954129fadb07443496f999f2f8eea1/66833199771.pdf
    • http://adice-area.com/pictures/files/vemimuxevezitiritoke.pdf
    • http://greatnice.club/updatefiles/file/gibodijejisap.pdf
    • http://kme-kme.cz/files/file/95607656628.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_off0000e448.bin
02e5a97fba277fb0aab602337831a39980e61952bf2f11b7bae31589c480695b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 18372 bytes
font_01_sfnt_off00011351.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 16792 bytes
font_02_sfnt_off00012b68.bin
f737989eb2bfaa11f3f97343ba9e2fc364f23fa6ab988eb7a4283bfc49a6be7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 10824 bytes