Malicious PDF — malware analysis report

Static analysis result for SHA-256 2277a9fbe9606447…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 13:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57a7365992e5e4f961ec20ef77ea5ebb SHA-1: 5dbf085454f98e06044a4b7bafc43829756bdfed SHA-256: 2277a9fbe960644766f5b24bfb31c5de85fa0422aefc087c0333692efef88d25
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports the attack pattern of tricking users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f8b5719ea44b8a699f01fcd89f82851/835886260.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/31cdfad662f1b8e64a5e485a0ef9b28b/96848567885.pdf
    • https://oteaexpert.fr/cite_imgs/file/21476801060.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac652e070---92048131722.pdf
    • https://veterinarycarefoundation.org/userfiles/file/makafawa.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1c7bd30b---48822930291.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6add16645de60f771fa3d176862da3a1/46500741488.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/bezafakuviba.pdf
    • http://kinel-hunter.ru/upfiles/file/93621628965.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/33972641368.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/59221dce076a0906b6a0d772527de0cc/notun.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4821cd51a45ad0b0e7d25a286fe6600a/25608988090.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/115b29dc44c45f7a34296103342d8e97/fovise.pdf
    • http://vertracapital.com/uploads/files/69434436146.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5ad4ec4ecf2ccbccd1767a2ce7046fb3/64880768729.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/vevosenoribelagokovub.pdf
    • https://hizlipin.com/calisma2/files/uploads/16180632332.pdf
    • http://ngocvietbungalow.com/upload/files/getitukezopadowujuwe.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5fa1b2be821a400120f8f250e8a2e9c2/wejepal.pdf
    • https://contabil-fiscal.ro/mm/file/wadasakimesifaleripinali.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e941394ad---pepofos.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/86813584039.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+fire+1.21+0+apk+download
    • 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_off0000f9ff.bin
025d55910b99dcfbac07df1307ce240189aa426ed21a14139da79f4ea4ecff01
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 17412 bytes
font_01_sfnt_off00012788.bin
dc20d1141531a0d96fe96c73e60f377b5eac3ec1c28d51c6e5b4ef5dfa737b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 10740 bytes
font_02_sfnt_off00014067.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14067 16792 bytes