Malicious PDF — malware analysis report

Static analysis result for SHA-256 475540300c253c06…

MALICIOUS

PDF

82.9 KB Created: 2021-07-15 13:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a001d64f2c397b4d7f772f9cc3cea98f SHA-1: ba0989c359574ae5bd6adad47a6524c20ccb42d8 SHA-256: 475540300c253c06ab18fa76c98cc5c3f4adccb797316a3d2419f936c8715fcc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting the idea that the primary function is to host malicious links rather than convey information.

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://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf397192f---71291202635.pdf In PDF document text
    • http://apvn.info/userfiles/file/towopumesevelakopukebas.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160942e8c68d7a---zisofadijowax.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/965c561b18a4a296be5d8058fe01d8c4/46999778208.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/ziwixupof.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/rujawepewuberudavelosej.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/suziwog.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b9c80354c6857ff38bfb20679572cddf/79457613430.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b92c157ad6b2d49ad4aa3c7dc3798797/fovajujuz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/68447049431.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210614060423_v8vdji.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jajewukezada.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/folidupu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6182d57fb3---funez.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/javorupa.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f671e08f3f---rugiwupifewapux.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/zuxewuvijebimodibug.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078178bf26ce---60122091596.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/banukulitasis.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/4f2ea397ab68e5b4d504693ec16f1cd1/24262324946.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/73590911581.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/84519237317.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/73059275790.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/te156bklv3o3u9g1qgbdpdsmb4/luwufanelivebamarovibiwa.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609324ba63f1b---wejovetunatewetezizuz.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d5780c218---76103947866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=integers+worksheet+for+class+6PDF 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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 17724 bytes
SHA-256: 1924b51d30ac9123c3bc52a69771693495524d63366c7ab701a4676b3f71215a
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10820 bytes
SHA-256: ddcb92b33a0a5f19f2c4d0165cfc2ec3eeca67989525c05b19feb4f63b5bb5b9
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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