Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b986d963da694c…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 09:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c600c0dcd1552f8b75190f40ead1874b SHA-1: bd34e983e36a2ec60106bc3603c456e7f9256a3a SHA-256: 89b986d963da694cabd7b6fa0e102922b71fa89cb507e20cd045ec181cbfc489
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=mahendra+guru+math+notes+pdf PDF link annotation
    • http://wintec-samu.hu/uploads/files/bazamatumuti.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/sibani.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cfe3546d---zujevej.pdfIn PDF document text
    • http://adveotec.com/img/file/fokevurejulikutoz.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kuwipajilijomeku.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31665606b---26502490512.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/xadowoguk.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/fijoxumesonawalevigenofuj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c332608d412bdfd8deb85dfc9ebca7fd/60628859619.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108291056507536.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a9caa3604---firoxijabimuwazebo.pdfIn PDF document text
    • http://emannsltd.com/userfiles/pipivutiba.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/88965019690.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/83973586617.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/wiritigufir.pdfIn PDF document text
    • https://arerp.kr/data/file///91119335142.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45b4261d2---54182759028.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/verigozizowud.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7134f2d5b2---35272716335.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/kixirepipelugas.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b12db45c3---43632557913.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/zilomaku.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6343db22e8af331282f469108ecdf42d/dubatogip.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db99d0d1a4b---75193071783.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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 21292 bytes
SHA-256: 7f1e2ed640feafe1f2d7d00e6f60eba8b9902a2c8e16f3cb0fb6c604a61046f5
font_01_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 10900 bytes
SHA-256: 684b052359d8c8a36b0c04cb22cd8f95dec1575f078e3adca92c042d4279c704

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