Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7af1ddbe53f1169…

MALICIOUS

PDF

82.6 KB Created: 2021-06-27 21:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd27eb8a3b3e86c09eea57e4d5b847df SHA-1: fd1d66b199a50fb070f16cfd99d66940b6ee652e SHA-256: f7af1ddbe53f1169fb108f55a19f997b9717c44af77eee63deaf59db4b9e1037
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5607i6qkpgspm25kp6oam1t0tu/91420110166.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3pn4g6d0rqsr6age2rgo7ksqs0/fixipab.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b7ea05f5cd9e7c13afc889aa0f608fd5/16320680338.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d56b77919---17505570166.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6f5f16c22913eb5dcf14fd4e87d53c4e/lugebo.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/4d5c604f677e479d91e134430fb1b815/45473637477.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3bc301a7445d1a045277462b14bea4b6/72397722918.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ep9eafu32pqigl16veoa8d93f9/sozexobevujezupozuzoret.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a4ffb388927d8f0342084d1ddadebffb/zikamukusonekowazusadokew.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b1a305b53---16386108478.pdf
    • https://nada70.org/userfiles/file/62435306595.pdf
    • http://navigator-nsk.ru/userfiles/file/91335987845.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a925337fcf4---37411741427.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1d459b786d6b6776a3d5edd311648e94/87286904119.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2df2f9e393d0a705f5ba5a684c48d1a0/81993077942.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/37ccd3107a15cc555e5e325649fe888f/3830652129.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/wetosubaguliju.pdf
    • http://lab4050.com/upload/editor/file/88687406000.pdf
    • http://hum-lucknow.org/test/fckeditor/file/78886738805.pdf
    • http://biosite.ru/images/news/file/8540340136.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bed95b0d68f---vinatufu.pdf
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/6509576635.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ecbf4d665cb546f8b941c97c5efa2484/vapasoluzole.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/063b638c48ea60d27590e196534e9f37/38054586165.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cda2c2b159c---20923740509.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stomach+ulcer+vomiting
    • 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_off0000e0d8.bin
8f3010a325d4b505079d635b7c9bbb97b1efad4fc891813a6f82f89cbc28510e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 10748 bytes
font_01_sfnt_off0000f96d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 16792 bytes
font_02_sfnt_off0001117f.bin
65509d6191fa45323d44f4f61d50c7b70023c2e2f4d9f9bf4d91ac64938c153c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 16916 bytes