Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d837ef153d3dbc…

MALICIOUS

PDF

85.9 KB Created: 2021-08-23 04:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3ce0ba9552cc3c97db4ec1ee605484d SHA-1: b9b1c2c70036cf7a32ddba7e06d0f47e4f105d52 SHA-256: 05d837ef153d3dbcbc5b298702a36fc1b6a44a74375fea90229332b273583a5c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content distribution attempt. The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS upload directories, suggesting an effort to obscure the true destination or leverage trusted domains. The presence of 'utm_term=check+your+ebt+balance+online+pa' in one URL suggests a potential lure for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://szabobuszberles.hu/files/files/wuvidirezi.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16114b159a7d2e---30142704935.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f56e00e729ce435ce27ee09bca221f7/94348948997.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bc74d8764---80814343888.pdf
    • http://emirates-offshore.com/uploads/image/file/67102910672.pdf
    • http://wellfoto.cz/pictures/files/49153091976.pdf
    • https://rotterdampools.com/contents//files/72009123819.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a86154ccda138b4cf8c53a736bda0be8/41302290662.pdf
    • http://aaaexpressac.com/userfiles/file/benipowipubovufez.pdf
    • https://artasedanasingaraja.com/uploadfck/file/kevilafakisidudoda.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d33d881c4---49544518879.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd3da0df8---6975416731.pdf
    • https://dbjadow.pl/attachments/file/nisorojulowowogenitekixa.pdf
    • http://coyada.com/up_images/up_images/5469586228.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/40427493686.pdf
    • http://htwy.com/upload/file/15782368325.pdf
    • http://freewest.at/1553439456.pdf
    • https://franchiseharbor.com/files/files/mokejitinodirabafaripo.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/400e6c75814f1db0eba40e40fed7b8e3/wadisakujejob.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/52280222203.pdf
    • http://alexlunacoach.com/img/editor/file/24425274998.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160822b9bca3b7---nivitasujuzavubukamu.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160725891d6e41---614743964.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/udh0i9gg1jl6ad1sb3ra083uv0/rixazubazogofasubofigalax.pdf
    • http://www.bufolari.com/public/immagini/file/13552589294.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=check+your+ebt+balance+online+pa
    • 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_off0000e8ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 16792 bytes
font_01_sfnt_off000100be.bin
31a498717f93f0a4a3405102ccbe9602c2deb7029c11ad4372bc1343eeac9e29
pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 17652 bytes
font_02_sfnt_off00012e8b.bin
8ab59ba3fa1704bd1f25b50406033c3a992d5ef765105a7050b05939cec5f128
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 10780 bytes