Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4174915ac399c8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 09:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2c82a246d30b5ec904c9f1d334d58d6a SHA-1: b338ab9727af453d753fc1f6eee4789d02be1365 SHA-256: dc4174915ac399c83ec0c42c04f308fade64f0dc4fb782d4e3e83f94e802c32d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=division+with+remainders+worksheet+grade+7 PDF link annotation
    • https://maryamghiasi.com/images/upload/files/65949664838.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/989596f84943d85fbcc2449774959ae4/tasaziworife.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfdd43c34---99646096390.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fbae2c4c---73859355530.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/rivomolubutumebo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16095420f3f58f---vuluguf.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747782c1952---14517695143.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/18371761264.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/6974052298.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/66129439930.pdfIn PDF document text
    • http://allasclub.com/campannas/file/pozanuvusejir.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/63351709202.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fd89dfa08e7---67125456134.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/52468976038.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/xoxisokera.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/99905250879.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/22769471912.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/603e995c281d891ec0091e2f54cdd115/90496064156.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/15235118095.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/timulebugamewafizazul.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3d1141ce685502ce06793cbe5d85291c/pupugososab.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62154e07d2---39174940238.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/0708949ea1636b568b64c000318df28e/95968369319.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108100534458987.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/vuraxagam.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/13547902179.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_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 16736 bytes
SHA-256: 803be8d00a126a9dbe2190867367f0063e705a6b139879978a53dff1dc0e6a3a
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 10944 bytes
SHA-256: 02e45c5542defcb22431adefb3b4943c20ac875f51ae0adf843529caaf541a64
font_02_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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