Malicious PDF — malware analysis report

Static analysis result for SHA-256 9183ac7714716281…

MALICIOUS

PDF

93.8 KB Created: 2021-07-18 11:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de019fc983ac91c6ab1c9a13bf803dbc SHA-1: 6e5b0ab8cd60f0863176a1ad5a23a718b7d53cf4 SHA-256: 9183ac77147162818cb2d5d72cfca4812a6751abf05fd40a1c3631c7aa449497
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's intent to trick the user into installing a fake browser extension or update, a common social-engineering tactic. The embedded URLs point to compromised CMS upload storage, suggesting a distribution method for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c8ae99ea0---fawadumutikoluxibenave.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aface587c---41479675461.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wiguxepirepugafenuvidewa.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e72bd5a6---bezupenebibofogumadok.pdfIn PDF document text
    • https://miet.hu/kepek/11716834729.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713640d7baa---45856076437.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c9dd263f0fa1c16d3ce4bde48986a71d/lokusagogiseva.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd98e3d9b---lapizejilenapulufina.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081787732994---30238450730.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210618101729451.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bff9f09cb2e---2092515566.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/40438875754.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f05c5d6b4547a696a0fddc5bb5eb2d28/totebagejebole.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/xuwiza.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ab66b30653ada8fc26e9b7f8d63467ca/dabononituzizuvixuk.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/palakisejotigotufamujal.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ba63533f5880bde020ebc0e4d9b9ab59/dizawelusiropatuzuge.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/dinawedagobejaxinejaz.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f068470d15---30055069531.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1621202718427.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/xixomi.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/26035484809.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511180152783564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=eps+to+pdf+converter+onlinePDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 22052 bytes
SHA-256: 34d34768b149739c49f397e6414b72b5b6e771637aa8de9a41f9866de1123a5e
font_03_sfnt_off0001512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512C 10500 bytes
SHA-256: 572f85572ce4387e69a42047348d433adb14c3965bc30365f6d5edc47140bf2b

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