Malicious PDF — malware analysis report

Static analysis result for SHA-256 81694c5ccd1fddb0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 20:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acdfe2ca7d49ae2804122292b58cd9ca SHA-1: 8beaa1c51b9075afd494e2d9dac547fc277f9e30 SHA-256: 81694c5ccd1fddb0921b38d119e00684530a673803f92fe37248e73463d43cc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of a link farm pointing to compromised WordPress upload directories and numerous other PDF files suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution. ClamAV and ML classifiers strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a33801cd7---tamiwinavipube.pdf In PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vufojigaxupawol.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8891aef4---82516357618.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/146116965ece3b385ddb2bf92b79a20f/29800489567.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/46938781274.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21b2624f16---javugirawoximikonujeminuk.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/pulifumemuwonejesitus.pdfIn PDF document text
    • http://alptw.com/images/files/86801966724.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/seposiwovibevij.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/bifajotomuse.pdfIn PDF document text
    • http://101balkon.ru/upload/files/lodojesejuwotoforuvufuru.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b93a85f9---gidudasagelurofe.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/75471334590.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb05a78ac---69343607408.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4911a6d66bdb4b792c0cf6ec588cb8c6/dotabigamevakuwifetifejup.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19506ba48---bixowagegukiripoduwixi.pdfIn PDF document text
    • http://orem.mn/uploads/files/ruzikajuxir.pdfIn PDF document text
    • http://bptramptour.pl/files/file/51174209167.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/daribizatozedipiraluxazu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eced72beac---jegixad.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/93647200110.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a22de140c2---pikim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tricep+exercises+to+hit+all+3+headsPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 17464 bytes
SHA-256: cfbd2e5ac33568ed7c56e090e3230bee9664ea667c7e533ac1df99cd1c6b6872
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 10744 bytes
SHA-256: 8d4339185354fe5c7bcd11326d3034b700c538eb703ba2ad6a46dd6ac70f804e

Open this report in the interactive analyzer, or submit your own file for analysis.