Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e576857ebab867…

MALICIOUS

PDF

85.1 KB Created: 2021-08-04 10:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 25dd9391ed9b3edf8157b2eb3ace0ce5 SHA-1: 3f0d0ed1fd02d12f31809598651361deb566b9f6 SHA-256: 18e576857ebab86779f00b442f99c24b1535242242341520b8b4241e2d52cf9d
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to WordPress sites utilizing formcraft or super-forms plugins, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wastran.ru/uplcv?utm_term=yesterday+evening+indirect+speech+examples PDF link annotation
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160831623a57e0---tokiwovotoxakefe.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e58b4ab78---jumovopobuzivuwalazugax.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/5f7b2g66d2licnl9k4j6sok591/83145935182.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/bipoton.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d8350e4a511---93402276680.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/80149700642.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ad8c8213543c398827b5e648d6a5d8f4/34804393186.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/poxijisemidefe.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f5tor1e5fcv96kt6tcd8v1eq4g/50505432514.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/gokamegubonomafugage.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/30169125251.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e51fe63fef---fagilunure.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/katidajus.pdfIn PDF document text
    • http://hnspkjx.com/d/files/jenafajufexofikukem.pdfIn PDF document text
    • https://micsys.in/userfiles/file/17233498792.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/rilevapekebagozekareli.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/21531486260.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079fff23c3a6---86561878246.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ufkjiqgs8q1c84mr0k9kigra0i/figubenesubiribadefivibe.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61488500296.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75f73b5f8---54062469502.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705726c0268---76887438101.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 11108 bytes
SHA-256: 6abf4fecd1382722bad88a24b8d05a9e553a8519386b42a55a911b9481b9f1ea
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 16584 bytes
SHA-256: fe37eb034a4414c7de97e4a2431f01be70d84cf32b5f495d978c427d10a05dbb
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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