Malicious PDF — malware analysis report

Static analysis result for SHA-256 8180fe58c3254bb2…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 20:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1d21658801a0eb2bf2bd53c3856ac11 SHA-1: 310bdbfd48ceba49a69885f6b8ece2bb84c2f3d6 SHA-256: 8180fe58c3254bb26ba8ba2af2b3465f748aca8d6c4c86151e29142dec356637
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing campaign, likely using a lure related to 'college board official sat study guide pdf download'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=college+board+official+sat+study+guide+pdf+download PDF link annotation
    • https://mimpishio1.com/contents/files/71886201014.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074991262003---kuzibafevawan.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021080521424573499.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/29763787383.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/73395301607.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///35256128918.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d2589e76---loxak.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/dc53f0953cb8bfd3c848fbcda01645ea/53113486177.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/51135179561.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/90645228906.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wibisumokajitulobedas.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/78472046487.pdfIn PDF document text
    • http://dgjst.com/upfile/file/nujog.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd29c01249---78000628010.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19c03ff32d1a2ff6e9cc7e6cda57d0ca/5966787783.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/v0r08haiet85cgig874pjci7db/laniven.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c58381254f6e0da7d23011644aed09a7/63732203438.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6ef47646---52520380767.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/70123007457.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/67254765405.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16083d14be7b18---niwodawuwujolunegigoponam.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/jusikunave.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909ee0b7e78---34730055095.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/73583537258.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 11264 bytes
SHA-256: 8e6d3b998a8cbe5c6d9f130c9391062db2ef854b7be6cc7c9c3286f2daa9af7f
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 19252 bytes
SHA-256: 7c4990d8fac8227218875fcdbd0fa478a9d4c869b69b1ef69b5c527c0f48daba

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