Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ae03f2ade362c3…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 13:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 115dba1be9867f77cad14516adb9f19a SHA-1: 796e7d6597decef9616e9ce1b857d5b53dadb0e2 SHA-256: e8ae03f2ade362c3b399215f1d8b3dc08dbe4902ab7d9d98285e317c2e5aa55b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into phishing or malware downloads. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3764d87c9a896a00d07f0f4cff0d5874/kulevojanujeme.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbc57a63f---37316524236.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b7dbd52bb88a7fc8cc2a8f4a1c5c2ccf/jomabon.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7ab7cd0f---55093450925.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab95c2dc94---mebazulixeluzuk.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ace43dbae---tejirakurexabofuwurize.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef158719a8---3087132859.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3s1i2b1j49ud0g1n05uvj43edt/29381677451.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8b07129316a5e61938ac365c70d58c06/6653954706.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/urve704n8e3b23ft5a48v6diek/felugejovujususiganuwukus.pdf
    • http://ansonseatery.com/uploads/files/45776072308.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/4p269u7jk0pfqrumatog0rn1rh/nabip.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c7d7cc348f33e4be0c608085f3fbb7d5/vudibeji.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2ccba7b63a153d9057bbda1bea060d76/24565131557.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/srks26q0nl9alurbf9dmar5m2u/putunorexoverutoguzase.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e2149c93b---lolunisepikavuxufese.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/895945fa906e2c073d4e3b510e763e9b/86639979443.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a6129fe6---18508249327.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608794b41cb40---78915440827.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098524fa5a73---givilelepokatemidenobavi.pdf
    • http://ekolojikweb.net/upld/userfiles/file/dudopuwal.pdf
    • https://avonsteel.com/UserFiles/file/53182656503.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=experiment+to+demonstrate+osmosis+in+living+tissue
    • 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_off0000eaa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 16792 bytes
font_01_sfnt_off000102b3.bin
b226b6f4d72b61d95c66ccee4c0328464666a4df85c1ece531b7727bcaac7bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 17532 bytes
font_02_sfnt_off00013056.bin
dbecf2874b23968a1aab4f5ddd2c505f252c46755f5f7a921838f67bbd0afaf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 10984 bytes

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